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329 Cards in this Set
- Front
- Back
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What is the basic unit of voltage?
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The volt
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What is the basic unit of current?
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The amp
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What is the basic unit of resistance?
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The ohm
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Which law of electricity is the most important for a mechanic to know?
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Ohm's law
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What is the three elements in Ohm's law?
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Voltage, current, and resistance (volts, amps, and ohms)
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What are five sources of electrical energy?
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Magnetism, chemical, light, heat and pressure
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What four things affect the resistance of and electrical conductor?
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The material, the cross-sectional area, the length and the temperature
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How can you tell the resistance of a composition resistor?
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By a series of colored bands around one end of the resistor
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What three things must all electrical circuits contain?
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A source, a load, and conductors
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What is the purpose of a capacitor?
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To store electrical energy
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What is the basic unit of capacitance?
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The farad
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Why should electrolytic capacitors not be used in a AC circuit?
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They are polarized, and will block current of the opposite polarity
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What is meant by inductance?
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To store energy in electromagnetic fields
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What is meant by impedance?
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Total opposition to the flow of alternating current. The vector sum of resistance, capacitive and inductive reactance.
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How can you find the polarity of an electromagnet?
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Hold the electromagnet in your left hand with your fingers encircling the coil in the direction the electrons flow. Your thumb will point to north end.
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In what units is impedance measured?
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In ohms
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What is the basic unit of power in a DC circuit?
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The watt
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What is meant by kilowatt?
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1,000 watts
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What happens to the current in a DC circuit the voltage is increased but resistance remains same?
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The current increases
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What are three types of DC circuits, with regard to the placement of the circuits?
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Series, parallel and series-parallel
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What is the basic unit of inductance?
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The henry
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How many cells are in a 24v lead-acid battery?
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12
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What is the specific gravity of the electrolyte in a fully charged lead-acid battery?
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1.275 and 1.300
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What is the range of temps of the electrolyte in lead-acid battery with no correction?
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70 and 90 degrees Fahrenheit
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What instrument is used to measure the specific gravity of electrolyte in a lead-acid battery?
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A hydrometer
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How is a lead-acid battery compartment treated to protect from corrosion?
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Paint with tar base paint or polyurethane enamel
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What is used to neutralize spilled electrolyte from lead-acid battery?
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Bicarbonate of soda and water
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How high should the electrolyte level be in a lead-acid battery?
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Up to the level indicator in the cell
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What precautions should be taken in a maintenance shop where both lead-acid & nickel-cadmium batteries are serviced?
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Keep battery and tools used separate
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Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?
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The electrolyte does not chemically change when charged or discharged. Specific gravity does not change
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What is used to neutralize spilled electrolyte from a nickel-cadmium battery?
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Boric acid and water
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What is meant by electromagnetic induction?
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The transfer of energy is not electrically connected
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How many ohms are in a magohm?
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One million (1,000,000)
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What constitutes a capacitor?
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Two conductors separated by an insulator
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What part of an apm is a milliamp?
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One Thousandth (0.001)
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What is meant by tolerance on an aircraft drawing?
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Allowable + or - variation from the dimension given
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Dose a capacitor in an AC circuit cause the current to lead or lag the voltage?
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Causes current to lead voltage
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What is meant by clearance on an aircraft drawing?
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Amount of space that is allowed between two parts
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What is an example of an inductor used in a magneto?
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The coil
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What info is given in the title block of an aircraft drawing?
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Name
Address of company of made part Name of part Scale of the drawing Name of draftsman Name of engineer approving part |
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Does an inductor in an AC circuit cause the current to lead or lag the voltage?
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Current to lag behind voltage
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How are dimensions shown on an aircraft drawing?
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By numbers shown in the break of a dimension line
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What is the formula for power in a DC circuit?
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Power = Voltage x current
(P = E x I) |
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How can you know that the aircraft drawing your are using is the most current version of the drawing?
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By the number in the revision block and by the log of the most recent drawings
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What is the relationship between mechanical an electrical power?
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1 horsepower = 746 watts
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How many views can there be in an orthographic projection?
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Six
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What is meant by true power in an AC circuit?
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Product of circuit voltage and the current that is in phase with this voltage
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How many views are used to show most objects in a aircraft drawing?
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Three
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In what units is true power expressed?
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Watts
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What is the purpose of a center line on an aircraft drawing?
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This is the line that shows the center of the object in the drawing
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What is meant by apparent power in an AC circuit?
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Product of the circuit voltage and the circuit current
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What is a fuselage station number?
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The distance in inches from the datum, measured along the longitudinal axis of the fuselage
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In what units is apparent power expressed?
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Volt-amps
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Where is the title block normally located on an aircraft drawing?
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Lower right-hand corner
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What is voltage?
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Electrical pressure
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What is the purpose of a cutting plane on an aircraft drawing?
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Shows where an object has been cut to allow an auxiliary drawing to be made. the arrows on a cutting plane show the direction the auxiliary drawing is viewed
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What is the basic unit of voltage?
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The volt
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How is the alternate position of a part shown on an aircraft drawing?
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A thin line made up of a series of long dashes separated by two short dashes
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What instrument is used to measure voltage?
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A voltmeter
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Where must a record be kept of current empty weight and current center of gravity of an aircraft?
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Aircraft flight manual or weight and records
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To measure voltage, is a voltmeter placed in series or parallel with the source of voltage?
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In parallel
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What is meant by the datum that is used for weight and balance?
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A reference which all longitudinal locations on the aircraft are referenced
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What is electrical current?
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The flow of electrons in a circuit
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Why are all items installed measured from the datum for W&B?
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Makes it possible to fine the center of gravity
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What instrument is used to measure current flow?
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An ammeter
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What are two reasons weight and balance control are important?
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For safety of flight
Most efficient performance |
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What two things happen when current flows through a conductor?
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Heat is generated and a magnetic field surrounds the conductor
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What is meant by moment?
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A force that tends to cause rotation. It is the product of weight times the distance of the object in inches from the datum
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To measure current through a component, is an ammeter placed in parallel or in series with the component?
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In series
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How do you find the moment of an item that is installed in an aircraft?
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Multiply weight of the item in pounds by its distance from the datum in inches.
W x A = M |
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What instrument is used to measure electrical resistance?
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An ohmmeter
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What is meant by the arm of an item?
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Distance between the center of gravity of the item and the datum
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Why must we consider the category under which an aircraft is licensed when we compute its weight and balance?
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The different categories have different maximum gross weights and different center of gravity ranges
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What is meant by continuity in an electrical resistor?
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The circuit is continuous when electrons can flow from one terminal of the power source to the other
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Where can you find the leveling means that are specified for a particular aircraft?
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Type Certificate Data Sheets for the aircraft
(TCDS) |
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What instrument is used to measure continuity in an electrical circuit?
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An ohmmeter
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What must be done to find the empty weight of an aircraft if it has been weighed with fuel in its tanks?
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Weight of the fuel and its moment must be subtracted from the weight and moment of the aircraft as it was weighed
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When measuring resistance of a component with an ohmmeter, should the circuit be energized?
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No, there should be no power on the circuit
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What must be done to tare weight when an aircraft is weighed?
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Weight of chocks used to hold the aircraft on the scales
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What is the basic equation of Ohm's law?
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E = I x R
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What must be done to the tare weight when an aircraft is weighed?
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Subtract from the scale reading to find the true weight
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What formula is used to find current when voltage and resistance are know?
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I = E/R
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What is meant by minimum fuel as is used in the computation of aircraft weight and balance?
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No more fuel than the quantity necessary for one-half hour of operation at rated maximum continuous power. It is the maximum amount of fuel used in weight and balance when low fuel may adversely affect the most critical balance conditions
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What formula is used to find resistance when voltage and current are know?
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R = E/I
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What is meant by the maximum zero fuel weight of an aircraft?
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The maximum weight of a loaded aircraft, less its fuel
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What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
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It increases
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What is meant by undrainable fuel?
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Fuel that is left in the tank, lines and components when the plane is in level condition and the fuel drained at main fuel strainer.
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What happens to the current in a conductor if the length of the conductor is doubled with all other parameters unchanged?
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It would decrease to one half
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Describe the way you would find the empty weight and empty weight center of gravity of an airplane if there are no weight and balance records.
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The aircraft is weighed, and the empty weight center of gravity is computed. Record these values in the new weight and balance records
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What is the voltage across each resistor connected in parallel across a 12-volt battery?
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12 volts
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What is meant by permanent ballast for an aircraft?
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Weight that is permanently installed to bring the empty weight center of gravity into allowable limits
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How much current flows through each of three resistors connected in series if the total current is 3 amps?
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3 amps
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Which has the more critical of gravity range, and airplane or helicopter?
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Helicopter
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What is the total resistance of three 12-ohm resistors connected in series?
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36 ohms
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What equipment must be installed in an aircraft when it is weighed to find its empty weight center of gravity?
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All the equipment listed in the aircraft required equipment list or that is permanently installed
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What is the total resistance of three 12-ohm resistors connected in parallel?
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4 ohms
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What is the significance of the empty weight center of gravity range of an aircraft?
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The aircraft cannot be legally loaded in such a way that its loaded center of gravity will fall outside of the allowable loaded CG range.
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What is meant by the capacity rating of a lead-acid battery?
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The number of hours a battery can supply a given current flow
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Why is empty weight center of gravity range not given in the Type Certificate Data Sheets for some aircraft?
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The empty weight center of gravity range is given only for aircraft that cannot be legally loaded in such a way that their loaded center of gravity will fall outside of the allowable limits.
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In what units is battery capacity expressed?
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In ampere-hours
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Of what material are most low-pressure rigid fluid lines made?
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1100-1/2 hard or 3003-1/2 hard aluminum alloy tubing
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What electrolyte is used in a lead-acid battery?
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Mixture of sulfuric acid and water
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Is the size of a rigid fluid line determined by its inside or its outside diameter?
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Outside diameter
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Does the specific gravity of the electrolyte in a lead-acid battery increase or decrease as the battery becomes discharged?
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Decreases
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When routing a fluid line parallel to an electrical wire bundle, which should be on top?
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Electrical wire bundle should be on top
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What is the open-circuit voltage of a lead-acid battery?
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2.1 volts
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What is the function of the lay line that runs the length of a flexible hose?
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This line shows whether or not he line has been twisted when it was installed.
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What gases are released when a lead-acid battery is being charged?
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Hydrogen and oxygen
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How can you distinguish an AN fluid line fitting from and AC fitting?
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AN fitting has a shoulder between the end of the flare cone and the first thread. the threads of an AC fitting extend all of the way to the flare cone
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What is the electrolyte used in a nickel-cadmium battery?
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Potassium hydroxide and water
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Where are quick-disconnect fluid line couplings normally used in an aircraft hydraulic system?
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Where the engine-driven pump connects into the hydraulic system
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Is the electrolyte level of a nickel-cadmium battery lowest when the battery is fully charged or fully discharged?
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Fully discharged
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Is the size of a flexible hose determined by its inside or its outside diameter?
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Inside diameter
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What is a result of cell imbalance in a nickel-cadmium battery?
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The low internal resistance allows current to flow between the unbalanced cells and generate haeat
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What is the minimum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system?
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5% longer than the distance between the fittings
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What is a thermal runaway?
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The large current flow allowed by the low internal resistance causes the middle cells to produce more heat than they can dissipate. The heat further lowers the internal resistance so more current can flow; this continues until the battery destroys itselt
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How tight should am MS flareless fitting be tightened?
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Tighten by hand, and then turn it with a wrench for 1/6 to 1/3 turn
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How may thermal runaway be prevented?
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By carefully monitoring the temp of the middle cells and controlling the charging current to prevent an excess of current flowing into the battery
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What damage can be caused by overtightening an MS flareless fitting?
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Overtightening drives the cutting edge of the sleeve deeply into the tube and weakens if
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How is it possible to know when a nickel-cadmium battery is fully charged?
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Completely discharge the battery and give it a constant-current charge of 140% if its ampere-hour capacity
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What kind of rigid tubing can be flared with a double flare?
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5052-O and 6061-T aluminum alloy tubing in sizes from 1/8-inch to 3/8-inch OD
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What is the principal advantage of Teflon hose for use in a aircraft hydraulic system?
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Teflon hose retains its high strength under conditions of high temp
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What precautions should be taken when flaring a piece of aluminum alloy tubing?
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End of the tubing must be polished so it will not crack when it is stretched with the flaring tool
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How much pressure is used to proof test a flexible hose assembly?
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Generally about two times the recommended operating pressure for the hose
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What is the proper type on nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging?
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Zyglo or dye penetrant
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Explain the procedure to use when making a dye penetrant inspection of a part?
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Clean the part thoroughly and apply the penetrant and allow it to soak for recommended time. Remove all penetrant from surface and then apply developer
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Explain the procedure to use when making a magnetic particle inspection of a part.
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Clean the part, magnetize it per service manual, flow the indicating medium over the surface and inspect it under a "black" light. Then demagnetize the part.
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What inspection method would be most appropriate for checking the internal structure of a wing for corrosion?
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X-ray inspection
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What inspection method would be most appropriate for checking a nonferrous metal part for intergranular corrosion?
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Eddy current inspection
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Why is it important that all engine parts which have beed inspected by the magnetic particle method be completely demagnetized?
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The parts will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces
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Why is it important that all parts be thoroughly cleaned before they are inspected by the dye penetrant method?
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Any grease or dirt in a fault will keep the penetrant from seeping into the fault
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Why is it important that a piece of aluminum alloy be quenched immediately after it is removed from the heat-treating oven?
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The grain structure will grow enough that intergranular corrosion is likely to form in the metal
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Explain the way a steel structure is normalized after it has been welded.
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Heat the steel to a temp above its critical temp and allow it to cool in still air
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Why is a piece of steel tempered after it has been hardened?
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When steel is hardened, it becomes brittle and tempering removes some of this brittleness
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What is meant by an icebox rivet?
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Rivet made of 2017 or 2024 aluminum. These rivets are heat treated and quenched, then stored in an icebox until they are ready to use. The cold storage delays hardening
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What type of loading should be avoided when using a self-locking nut?
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Any application where there are rotational forces
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What determines the correct grip length of a bolt used in an aircraft structure?
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The grip length of the bolt should be the same as the combined thicknesses of the materials being held by the bolt
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How tight should the nut be installed on a clevis bolt that is used to attach a cable fitting to a control surface horn?
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Should not be tight enough to prevent the clevis bolt from turning in the cable fitting and the horn
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Why is it very important that the surface of a piece of clad aluminum alloy not be scratched?
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If the scratched through the pure aluminum, corrosion could form
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What determines the size of tip that is to be used when gas welding steel?
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The thickness of the material, the size of the tip determines the amount of heat that is put into the metal
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How is the flux removed from a piece of aluminum that has been has welded?
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Scrubbing it with hot water and a bristle brush
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What must be done to a welded joint if it must be rewelded?
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All of the old weld must be removed, so the new weld can get good penetration into the base metal
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What kind of measuring instrument is used to measure the runout of an aircraft engine crankshaft?
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A dial indicator
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What measuring instruments are used to measure the fit between a rocker arm shaft and its bushing?
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The outside of the shaft is measured with a micrometer caliper. The inside of the bushing is measured with a telescoping gage/micrometer
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What is the smallest size cable that is allowed to be used in the primary control system?
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1/8-inch diameter
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What type of control cable must be used when pulleys are used to change direction of the cable travel?
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Extra-flexible cable (7 x 19)
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Explain the way a piece of aluminum alloy is solution heat-treated.
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In an oven to proper temp for a specified time; then removed and quenched in water
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What is meant by precipitation heat treatment of a piece of aluminum alloy?
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After solution heat-treated, it is held at a specified elevated temp for a period of time.
(This is also called artificial aging) |
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How does filiform corrosion usually appear on an aircraft structure?
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As thread-like lines of puffiness under a film of polyurethane or other top coats
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What is the proper way to extinguish an induction system fire that occurs when starting a reciprocating engine?
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Keep the engine running to try an blow out the fire. If this dose not work, use a CO2 fire extinguisher directed into the carb
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What type of fire extinguisher is best suited for extinguishing and induction fire in a reciprocating engine?
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Carbon dioxide or CO2
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What is meant by a liquid lock in the cylinder of an engine, and how is one cleared?
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Oil accumulates inside the cylinder and prevents the piston from moving to top of stroke. To clear, remove the spark plug and turn the crankshaft until all the oil is forced out
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What special precautions should be taken when towing an aircraft that is equipped with a steerable nose wheel?
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Be sure it dose not turn past its stops, or if it has torsion links (disconnect then when towing)
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When starting an engine that is equipped with a float carb, in what position should the carb heat control be placed in?
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In the "Cold" position
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How far ahead of an idling turbojet engine does the danger area extend?
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25 feet
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Why is it important that turbine fuel not be mixed with aviation gasoline?
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The turbine engine fuel will cause the engine to detonate
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What grade of aviation gasoline is dyed blue?
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100 Low Lead
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What damage is likely to occur if a recip engine that is designed to use 100LL is operated on 80 octane?
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Detonation will occur, which will cause such things a bent connecting rods, burned pistons and cracked cylinder heads
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What is meant by detonation in a recip engine?
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The uncontrolled burning of the fuel in the cylinder. It is an explosion, rather than a smooth burning
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What is the danger of using a fuel that vaporizes too readily?
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Vapor lock can occur in the fuel lines. This will shut off the flow of fuel to the engine
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What type of fuel is Jet-A?
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A heavy kerosine base, a flash point of 110-150F, a freeze point of -40F
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What is the significance of the two numbers, 100/130, in the dual rating of aviation gasoline?
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The first number is the octane rating or performance number of the fuel when operating with a lean mixture, and the last number is the octane rating when operating with a rich mixture
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What are two functions of tetraethyl lead that is added to avgas?
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It increases pressure & temp of the fuel, and acts as a lubricant for the valves
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What info must be located near the fuel tank filler opening on a recip?
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The word "Avgas", and the minimum fuel grade
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What info must be located near the fuel tank filler opening of a turbine engine?
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"Jet Fuel" the permissible fuel designations, or reference (AFM). The maximum permissible fueling pressure
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What action should a mechanic take while taxiing an aircraft on a runway if the tower shines a flashing red sight at him?
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Taxi the aircraft clear of the runway in use
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What publication lists the standard had signals that are used for directing a taxiing aircraft?
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ASA-AMT-G, general textbook, page 629
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What should be done to a recip fuel system if turbine fuel is inadvertently put into the tanks and the engine is ran?
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Drain the entire fuel system and flush with avgas, compression check and borescope the engine. Drain the oil/change filter, check all filters, and then do a run-up check of the engine
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Where is filiform corrosion most likely to occur on an aircraft?
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Under a dense coating of topcoat enamel such as polyurethane.
It is caused by improperly cured primer |
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Where is fretting corrosion most likely to occur?
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In areas where there is movement between two parts, and no way for the corrosion to be removed after its formed
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Where is intergranular corrosion most likely to occur?
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Along the grain boundaries of aluminum alloys that have been improperly heat-treated.
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Where is dissimilar metal corrosion most likely to occur on an aircraft?
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Anywhere different types of metal come in contact with each other, especially where moisture is present
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Where is stress corrosion most likely to occur?
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In any metal component under tensile stress. The metal around holes in castings that are fitted with pressed-in bushings
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What must be done to a piece of aluminum alloy to remove surface corrosion and to treat the metal to prevent further corrosion
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Remove the residue with a bristle brush or nylon scrubber. Neutralize the surface with chromic acid then protect the surface with paint
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What is used to keep corrosion from forming on structural aluminum alloy?
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An oxide coating or aluminum cladding
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How may rust be removed from a highly stressed metal part?
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By glass bead blasting then polish with fine buffing compound or cloth buffing wheel
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What tools are proper for removing corrosion from aluminum alloy?
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Aluminum wool or aluminum wire brush. Severe corrosion can be removed with a rotary file
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What is used to clean transparent plastic windshields and windows?
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Mild soap and plenty of clean water
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What is used to neutralize the electrolyte from a lead-acid battery that spilled?
|
Solution of bicarbonate of soda and water
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What is used to neutralize the electrolyte from a nickel-cadmium battery that spilled?
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Solution of boric acid and water, or vinegar
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What solvent is recommended for removing grease from aircraft fabric prior to doping it?
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Methyl Ethyl Ketone (MEK) or lacquer thinner
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What can be used to repair the anodized surface of an aluminum alloy part?
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A chemical conversion coating such as Alodine
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What type of device is used to remove surface corrosion form a piece of magnesium alloy?
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A stiff hog-bristle brush
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How is the inside of structural steel tubing protected from corrosion?
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Tubing is filled with hot linseed oil and then drained
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What records must be made of a 100-hour inspection before the aircraft is approved for return to service?
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Entry made in maintenance records describing type of inspection
The extent of the inspection The date and total time in service Signature + certificate number of the person approving or disapproving for return to service |
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What record must be made of the compliance of a Airworthiness Directive?
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Entry in maintenance records stating AD was complied with
AD number and revision date Date of compliance + total time The method of compliance and whether or not it is a recurring AD If it is recurring, the time of the next compliance must be noted |
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What record must be made of a major repair to an aircraft structure?
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A 337 Form must be completed for the repair, and a record made in maintenance logs referencing the Form 337 by its date
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How many copies must be made of a Form 337 after a major repair is made? What is the disposition of each copy?
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At least two copies, the original signed goes to the owner, and a copy goes to the FAA district office
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Who is authorized to perform a 100-hour inspection?
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Airframe and a Powerplant mechanic
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Who is authorized to perform an annual?
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A&P mechanic who holds an Inspection Authorization (IA)
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For how long must the record of a 100-hour inspection be kept?
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One year, or until the next 100-hour is completed
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Can a A&P supervise an unlicensed person as he performs a 100-hour inspection?
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No, a certificated mechanic must personally perform the inspection
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Where can you find a list of the basic items that must be inspected on a 100-hour inspection?
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14 CFR Part 43, Appendix D
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Where can you find an example of the correct type of write-up to use for recording a 100-hour inspection in the aircraft maintenance records?
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14 CFR 43.11
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What is done with the aircraft maintenance records that include the current status of the applicable AD's when the aircraft is sold?
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These maintenance records must be transferred with the aircraft when sold
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What is meat by a progressive inspection?
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An FAA approved inspection schedule. This allows the competed inspection to be done over a period of time to keep down time to a minimum
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Who is authorized to rebuild an aircraft engine and issue a zero time maintenance record?
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Only the manufacture of the engine or a authorized repair station
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What action must a mechanic take it the aircraft being inspected on a 100-hour inspection fails because of an unairworthy component?
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The maintenance records must indicate that the aircraft has been inspected and found to be in unairworthy condition because of certain discrepancies. A signed/dated list of discrepancies must be given to the owner
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What is meant by matter?
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Anything that occupies space and has weight
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What are the three basic physical states in which matter can exist?
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Solid, liquid and gas
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What is meant by pressure?
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Force that acts on a unit of area
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What is the standard sea level atmospheric pressure expressed in inches of mercury, and in pounds per square inches?
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29.92 and 14.69
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What characteristic of the atmosphere determines the speed of sound?
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Its temperature
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What is meant by the density of air?
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The weight of a given volume of air
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How much force is produced by 1,000 psi of hydraulic pressure acting on a piston whose area is 20 sq in?
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20,000 pounds
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What is meant by the fulcrum of a lever?
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The point about which the lever rotates
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Give an example of a first-class lever, a second-class and a third-class lever.
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First-class: A screwdriver being used to pry a lid
Second-class: A wheelbarrow Third-class: A hydraulically retracted landing gear |
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How many cubic inches of fluid is forced out of a cylinder by a piston whose area is 20 sq in when the piston moves five inches?
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100 cubic inches
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What is meant by a temp of absolute zero?
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The temp at which all molecular movement stops
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What is the Celsius equivalent of a temp of 50 degrees F?
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10 degrees C
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What formula is used to find the amount of work done when an object is moved across a floor?
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Work=Force x Distance
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What determines the mechanical advantage of an arrangement of ropes and pulleys?
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The number of ropes that support the weight
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What determines the mechanical advantage of a gear train?
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The ratio between the number of teeth on the drive gear and the number of teeth on the driven gear
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What will happen to the pressure of a confined gas if the temperature of the gas is increased?
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The pressure will increase
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What are three methods of heat transfer?
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Conduction, convection, and radiation
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What is meant by the absolute humidity of the atmosphere?
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The actual amount of water that is in a given volume of air
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What is an FAA Advisory Circular?
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A publication put out by the FAA for info, rather than for regulation
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What is a Federal Aviation Regulation?
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Actual law regarding the conduct of aviation activities
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Where can a mechanic find specific instructions for the maintenance of a particular aircraft?
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FAA approved maintenance manual produced by the manufacture
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What is the purpose of an AD?
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To warn the owner of a condition that has been discovered that renders the aircraft, engine or component unairworthy
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Where can a mechanic find a list of major alterations that have been made and approved for FAA certificated aircraft?
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In the Summary of Supplemental Type Certificates
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In what part of the regulations can a mechanic find the airworthiness standards for normal, utility and acrobatic category aircraft?
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14 CFR Part 23
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In what part of the regulations can a mechanic find the airworthiness standards for transport category?
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14 CFR Part 25
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In what part of the regulations can a mechanic fine a list of items that must be inspected on a annual or 100-hour inspection?
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14 CFR Part 43 Appendix D
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In what information provided by the FAA can a mechanic find a list of the engines that are approved for a specific FAA certificated airplane?
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In the Type Certificate Data Sheets for the aircraft
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In what part of the regulations can a mechanic find the specifications for the identification numbers that must be displayed on an aircraft?
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14 CFR Part 25
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What type of info is issued by the manufacture of an aircraft or engine that allows the mechanic to properly maintain the aircraft or engine?
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FAA approved service manuals
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How dose the manufacture of an aircraft or engine keep the mechanics in the field aware of changes that affect he safety and performance of the aircraft or engines?
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By issuance of service bulletins
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In what government publication can a mechanic find the category in which a particular aircraft is certificated?
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In the Type Certificate Data Sheets for the aircraft
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What part of the FAR's gives the requirements for the issuance of a mechanic certificate?
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14 CFR Part 65
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What are the two ratings that can be issued to a mechanic certificate?
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Airframe and Powerplant
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For how long is a mechanic certificate valid?
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It is effective until it is surrendered or revoked
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What is the recency of experience requirement for keeping a mechanic certificate valid?
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The holder of the certificate must have used it technically or in a supervisory capacity for at least six months of the preceding 24 months
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For how long is a temporary mechanic certificate valid?
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120 days
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Is it legal for a certificated mechanic to make a minor repair to and instrument?
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No, unless operating under a Certificated Repair Station approved for this opperation
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Who is authorized to approve an aircraft for return to service after a major repair has been made to its basic structure?
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A&P with IA
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Is it legal for a certificated powerplant mechanic to make a major repair to a prop?
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No, unless he is operating under a Certificated Repair Station
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In what part of the FAR's can a mechanic find a list of operations that are considered to be a major airframe repairs?
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14 CFR Part 43 Appendix A
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In what part of the FAR's can you find a list for 100-hour inspection?
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14 CFR Part 43 Appendix D
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Is it legal for a certificated mechanic to supervise an uncertificated person performs a 100-hour inspection on an FAA certificated aircraft?
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No, only a certificated mechanic can perform a 100-hour
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Who is authorized to conduct an annual?
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A&P with IA
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Under what conditions can a mechanic with only a powerplant perform maintenance on the airframe?
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He can preform the maintenance under the supervision of a airframe mechanic.
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Who is responsible for ensuring that all of the maintenance records are kept up to date?
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owner of operator
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Who is authorized to perform the inspection on an altimeter under 14 CFR 91.411
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FAA certificated repair station
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How soon must the holder of an FAA mechanic certificate notify the FAA of a permanent change in address?
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Within 30 days
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What is a butt line?
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A reference line to the right or left of the center line of the aircraft
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What is a detail drawing?
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Shows all the components of a part in an exploded form. A parts list is included with an assembly drawing
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What is an installation drawing?
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Shows the location of the parts and assemblies on the complete aircraft
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What type of drawing is most helpful in troubleshooting a system?
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A schematic diagram
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When should an aircraft be reweighed?
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After a extensive repair of alteration that could change its weight or center of gravity
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Is there a Federal Regulation requiring that all private aircraft be reweighed periodically?
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No
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What must be done with temporary ballast when weighing and aircraft?
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It must be removed from the aircraft
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Where is the center of gravity for most airplanes located in relation to the center of lift?
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CG is normally ahead of the center of lift
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What is meant by the center of gravity range?
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The distance in inches between the forward allowable center of gravity and the rearward allowable center of gravity
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What is a loading envelope?
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The enclosed area on a graph of an airplane's loaded weight and CG location. If lines drawn from the weight and CG cross within this envelope the airplane is properly loaded
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Of what material should rigid fluid lines be made that carry high-pressure hydraulic fluid?
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Annealed or 1/4-hard corrosion-resistant steel
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Why is it necessary to magnetize a part both circularly and longitudinally when inspecting a steel part by the magnetic particle method?
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To detect faults that extend across as well as lengthwise within the part
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Does circular magnetization detect parts that are across or lengthwise to the part?
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Lengthwise
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How is steel hardened?
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Heated to its critical temp and quenched in water,brine or oil
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What is meant by tempering steel?
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Steel is first hardened; then some of the hardness is removed to relieve some of the internal stresses and brittleness
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What are two methods of case hardening?
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Carburizing and nitriding
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What are the two most commonly used rivet heads?
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MS20470 universal head and MS20426 100 degree countersunk head
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What mark on the head of a rivet identifies the following alloys: 2117-T, 2017-T, 2024-T, 5056-T?
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2117-T recessed dot
2017-T raised dot 2024-T raised double dash 5056-T raised cross |
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What is the meaning of this rivet designation: MS20470AD4-6?
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MS20470 = Universal head
AD = 2117-T aluminum alloy 4 = 4/32 (1/8) inch diameter 6 = 6/16 (3/8) inch long |
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What bolt is described by this number AN6-14A?
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AN6 = Hex head bolt, 6/16 (3/8) inch diameter
14 = Length = 1-4/8 (1-1/2) inch long A = The shank is not drilled for a cotter pin |
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What is indicated by a triangle on the head of a steel bolt?
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Close tolerance bolt
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What is a correct application for self-tapping sheet metal screws on an aircraft?
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The may be used to hold nonstructural components onto the aircraft
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How can you tell when a self-locking nut must be discarded?
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When you can screw the nut onto a bolt without having to use a wrench
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What is a channel nut?
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A series of nuts mounted loosely in a channel that is riveted to the aircraft structure. You can install screws in a channel nut without having to hold the nut with a wrench
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Of what two materials are cotter pins made?
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Low-carbon steel and corrosion-resistant steel
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What is the basic wood used for aircraft wing spars?
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Sitka spruce
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What type of fabric is most widely used for covering aircraft structures?
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Heat-shrinkable polyester fabric
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What is the alloy number of the most commonly used aluminum alloy for aircraft structural use?
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2024-T
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What is the alloy number of a high strength aluminum alloy that has zinc as an alloying component?
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7075
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What type of composite material is used when stiffness is the prime requirement?
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Graphite (carbon)
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What type of composite material is used when toughness is the prime requirement?
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Kevlar
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What precision tools are used to measure the inside of a small hole?
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A small hole gage and a micrometer caliper
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What is the procedure if a hung start occurs when starting a turbojet engine?
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Terminate the starting operation and find the reason the engine would not accelerate as it should
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Why is it important that the aircraft and the fuel truck be grounded together before the aircraft is fueled?
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Grounding prevents the buildup of static electricity that causes sparks that could ignite the fuel vapors
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What precaution must be observed regarding the tools used when servicing an aircraft oxygen system?
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Be sure that there is no oil or grease on the tools. Pure oxygen can cause spontaneous combustion of petroleum products
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What kind of knot is used for securing an airplane with rope?
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Bowline
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What documentation is required for a certificated aircraft to legally operate on automotive gasoline?
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The must be a STC for the aircraft to operate on automotive gas
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Where can you find an example of the correct type of write-up to use for recording a 100-hour inspection in the aircraft maintenance records?
|
14 CFR 43.11
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What is meant by the resonant frequency of an aircraft structure?
|
The frequency that produces the greatest amplitude of vibration in the structure
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What is the principle upon which ultrasonic inspection is based?
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Any fault within a material will change the material's resonant frequency. Comparing the resonant frequency of a known sound material with the material under test will indicate the presence of a fault
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What are two types of fluids?
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Liquid and gaseous
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What is meant by the density of a fluid?
|
the mass-per-unit volume of the fluid
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What is meant by the specific gravity of a fluid?
|
The ratio of the density of the fluid to the density of pure water
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What effect does the increase in temp of a confined gas have on its pressure?
|
pressure increases
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What effect does an increase in volume of a gas have of its temp it is pressure remains constant?
|
temp decreases
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What effect does an increase in the pressure of a confined gas have on its temp?
|
temp increases
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What is the difference in the fluids used in a hydraulic system and those used in a pneumatic system?
|
fluids in hydraulic system are incompressible, but they are compressible in a pneumatic system
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What effect on density altitude is caused by an increase in air temp?
|
Air density decreases and the density altitude increases
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What effect does an increase in density altitude have on engine performance?
|
As air density decreases engine performance decreases
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What effect does high humidity have on piston engine performance?
|
Decreases engine performance
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|
What does the specific gravity of the electrolyte of a lead-acid battery indicate?
|
The amount of acid relative to the water in the electrolyte. This is an indication of the state of charge of the battery
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|
What causes ice to change into a liquid water?
|
The absorption of heat energy
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What happens inside a solid material when it absorbs heat energy?
|
Molecules within the material move faster
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|
What is the basic unit of heat in the English system?
|
British Thermal Unit
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|
How much work will one Btu of heat energy perform?
|
778 foot-pounds of work
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Why do most metals expand when they are heated?
|
As heat is absorbed , he electrons move faster and expand their orbits in the molecules of the metal
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What is meant by the density of air?
|
The weight of a given volume of air
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What is meant by relative wind with regard to an airfoil?
|
The direction the wind strikes a airfoil
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What is meant by the angle of attack?
|
The acute angle formed between the chord line of an airfoil and the direction the air strikes the airfoil
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What is meant by the critical angle of attack?
|
The highest angle of attack at which the air passes over the airfoil in a smooth flow. Above the critical angle the airflow breaks away and becomes turbulent
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What is meant by air density?
|
The mass of air in a given volume
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What is meant by weight?
|
Measure of the force of gravity acting of a body
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What is meant by thrust?
|
Forward aerodynamic force produced by a prop, fan, or turbojet engine as it forces a mass of air to the rear
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|
What is meant by drag?
|
The aerodynamic force acting in the same place as the relative wind striking an airfoil.
Drag acts in the direction opposite to thrust |
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|
What is meant by autorotation in a helicopter?
|
The aerodynamic force that causes a helicopter rotor to spin with no engine power applied to the rotor
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|
|
What is meant by translational lift in a helicopter?
|
The additional lift produced by a helicopter rotor as the helicopter changes from hovering to forward flight
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|
What is a Type Certificate Data Sheet?
|
A document that sets forth essential factors and other consideration which are necessary for U.S. airworthiness of aircraft, engines, and props
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|
What document would you use to find an approved repair for a damaged wing spar?
|
The structural repair manual for the aircraft
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|
What document would you use to find the part number for a landing light bulb for an airplane?
|
The illustrated parts catalog
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|
What document would you use to troubleshoot a malfunctioning electrical flap system?
|
Aircraft wiring diagram manual
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|
Where would you find the empty weight of a airplane?
|
Weight and Balance manual
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|
|
What FAA publication describes methods of nondestructive testing?
|
AC 43-3
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|
What is the purpose of a minimum equipment list (MEL)?
|
An MEL permits operations with certain inoperative items of equipment for the minimum period of time necessary until repair or replacement can be done
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|
What is a master minimum equipment list (MMEL)?
|
A document approved by the FAA that lists the minimum operative instruments and equipment required for safe flight in that aircraft type in each operating environment.
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|
What is the first step in the issuance of an AD?
|
A notice of proposed rulemaking (NPRM) is published in the Federal Register
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|
|
What type of AD may be adopted without an NPRM?
|
AD's of an urgent nature are issued as immediately adopted rules without prior notice
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|
How is info on an emergency AD sent to the owners?
|
First-class mail, or other electronic method
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|
What publication lists all of the ADs that apply to aircraft, engines, props, or appliances?
|
AC 39-6 Summary of Airworthiness Directives
|
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|
What is the significance of the identification number 91-08-07-R1?
|
91 - This AD was issued in 1991
08 - This AD was issued in the eight biweekly period (15th or 16th week) of 1991 07 - This is the seventh AD issued during this period R1 - This is the first revision of this AD |
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|
Is it mandatory that the info in an AC be complied with?
|
No, this info is advisory in nature
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|
May all of the info in AC 43.13-1B be used as approved data?
|
No, it is acceptable, but not necessarily approved data
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|
What is the purpose of General Aviation Airworthiness Alerts?
|
They contain info gleaned from Malfunction and Defect Reports to worn maintenance personnel of problems that have been reported
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|
What is the minimum age for a mechanic certificate?
|
18
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How many months of practical experience is needed to qualify for an A&P ratings?
|
30 months
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