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130 Cards in this Set
- Front
- Back
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Cabin atmosphere control system |
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How does a continuous flow oxygen system operate? |
Oxygen flows from a charged cylinder to a high pressure line to a reducing valve and to a mask outlet |
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What type of oxygen must be used in aircraft? |
Aviators breathing oxygen |
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How does a basic pressure demand oxygen system operate? |
Oxygen flows from a charged cylinder to a pressure demand regulator,adjustable by crew member |
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What must be accomplished if an oxygen system has been open to atmosphere for 2 hours or more? |
The system must be purged to remove moisture |
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What is used to purge oxygen lines of moisture? |
Dry nitrogen, dry air, or oxygen |
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What safety precautions should be observed when servicing oxygen systems? |
Clean, grease free tools and hands, no smoking or open flames within 50ft, do not use adhesive tape of any kind. |
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What are two groups of independent cabin compressors? |
Positive displacement and centrifugal |
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What is Roots blower? |
An engine driven compressor |
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What method is used by some turbine powered? |
Bleed air from the turbine engine compressor |
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What method is used by some turbine powered aircraft for pressurization? |
Bleed air from the turbine engine compressor |
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What pressurization control unit will change the position of the outflow valve? |
The cabin pressure controller |
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What is the principal control of the pressurization system? |
The outflow valve |
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What components are used in an air cycle cooling system? |
An expansion turbine, air to air heat exchanger, and various valves |
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What causes temperature drop in air cycle cooling system? |
The compressed air performs the work of turning a turbine,and it undergoes a pressure and temperature drop |
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How does a water separator remove moisture from the air? |
The moist air passed through the vanes that swirl the air and the droplets are collected and drained |
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What is vapor cycle cooling? |
A closed system in which a refrigerant is circulated through tubing and a variety of components to remove heat from the aircraft |
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What components are in a vapor cycle cooling system? |
A receiver dryer, evaporator, compressor, condenser, and expansion valve |
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Why is oil added to a vapor cycle freon system? |
To seal and lubricate the compressor |
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What is the function of ventilating air in a combustion heater? |
It is the air that is warmed and sent to the cabin |
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What are the sources of ventilating air in a combustion heater? |
A blower/fan or ram air |
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Aircraft instrument systems |
System |
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What can be used to a static check a manifold pressure indicator? |
Current atmosphere pressure |
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What flight instruments are usually connected to a pitot static system? |
Rate of climb, airspeed, and altimeter |
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What causes an electric driven gyro rotor to tilt when the aircraft is turning? |
Gyroscopic possession |
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What indication errors may be found in altimeter? |
Scale, hysteresis, and installation |
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What is a synchro type remote indicating system? |
A system that transmits information from one point to another point (flap position) |
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What does a tachometer indicate? |
Crankshaft and turbine rotor speed |
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Where does an electrical resistance temperature indicator receive a signal? |
From a temperature sensitive element (or bulb) |
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What type of indicating system is a turbine engine exhaust gas temperature system? |
A thermocouple type system |
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What methods are used to drive turn and bank/slip indicator? |
Vacuum,air pressure,or electricity |
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What is used as a reference for range marking instruments? |
Aircraft specifications,or type certificate data sheets,and flight manuals |
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What does a yellow mark on an instrument dial indicate? |
Caution |
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Why are slippage marks used on instrument glass covers? |
To indicate glass rotation in the bezel |
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When range markings are are placed on an instrument glass,what precautions must be taken? |
The glass must be marked for slippage indication |
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What is required after replacement of components connected to a pitot static system? |
A leak test |
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What is the meaning of swinging a compass? |
Correcting for deviations by adjusting the compensating magnets |
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Name at least two items that should be looked for during an inspection of a magnetic compass? |
(1) security of attachment (2)the scale should be readable |
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Communication and navigation systems |
Cans |
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What are three basic autopilot systems? |
Gyros,servos,flight controllers,computer and amplifier |
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Whaler should a DME antenna be located? |
On the lower surface of the aircraft fuselage, centerline |
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What powers an emergency locator transmitter (ELT)? |
A self contained battery |
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What is one method used to monitor the output signal during an ELT test? |
A VHF communication receiver turned to 121.5 MHz |
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What time of day should you perform the maintenance tests of an installed ELT? |
The test should be conducted during the first 5 minutes after the hour; at any other time they should be coordinated with the nearest control tower or flight service station |
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How does bonding help reduce radio interference? |
By providing a low impedance ground return |
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How often does the ATC transponder require certification? |
Every 24 calendar months |
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How may the determination be made to replace or recharge the battery in an ELT even through the set operates? |
The expiration date for replacing or recharging is marked on the outside of the transmitter and entered in the aircraft maintenance record |
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Aircraft fuel systems |
Afs |
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What are the sensing elements of an autopilot system? |
A directional gyro,turn and bank gyro,altitude gyro,and altitude control |
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What are actuating (output) elements of an autopilot system?whatbis th |
Servos that operate the control surfaces |
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What is the most common communication system in use? |
Very high frequency (vhf) system |
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What is VOR equipment used for? |
Navigation |
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What are the components of a typical airborne VOR system? |
A receiver,visual indicator,frequency selector,antennas,and power supply |
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What is ADF? |
A automatic direction finder |
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Why are two antennas or a single multi element antenna usually required for an ILS system? |
One for the localizer, one for the glide slope receiver |
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What information does a glide slope beam provide? |
Vertical guidance for correct angle of descent |
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What is a DME? |
Distance measuring equipment |
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What is the purpose of a fuel jettisoning (dump) system? |
To reduce the weight of the aircraft to a specified landing weight |
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What method may be used to check a fuel tank for leaks after a weld has been made? |
The tank must be pressurized and soap n water spray on the line |
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When would a fuel jettison system be required for small aircraft? |
It is required when the maximum take off weight exceeds the maximum landing weight |
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Aircraft electrical systems |
AES |
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What controls the output voltage of an alternator? |
A generator control unit |
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What is the purpose of the fuel tank internal baffles? |
To resist fuel surging caused by changes in the altitude of the aircraft |
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Why should you wait a period of time after fueling before checking fuel sumps? |
To allow time for water and sediment to settle to the drain point |
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What are two types of fuel tanks? |
A bladder type fuel tank and integral fuel tank |
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What supports the weight of the fuel in a bladder type fuel cell? |
The structure of the cavity that the cell fits into |
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What is a wet wing type construction? |
Integral fuel tank |
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What indication could be used to determine when there may be danger of ice crystals forming in the fuel of the turbine powered aircraft? |
Fuel temperature or a differential pressure type indicator |
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What are four types of fuel quantity gauges in use today? |
Sight gauge,mechanical,electrical,and electronic |
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What is an electrical operated fuel tank shutoff valve in transit light? |
A light that indicates when the valve is in motion |
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What should be done to an old gasket n seal when replacing fuel system components? |
It should be removed n replaced with new gasket |
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How long should a bonding jumper wire be? |
As short as practical |
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What factors should be considered when selecting wire size for electrical power? |
Allowable power loss,permissible voltage drop,and current carrying ability |
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How can a particular wire in a bundle be identified? |
By the identification code on the wire |
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Where is the white position/navigation light mounted? |
On the tail |
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Position and warning system |
PWS |
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What is the reason for a master caution warning system in aircraft? |
To draw attention of the crew to a critical situation in addition to an annunicator that describes the problem |
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What is the purpose of a Mach warning system? |
It provides an aural warning that aircraft speed limits have been exceeded |
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How does a takeoff aural warning different from a landing gear aural warning? |
The aural horn for takeoff is intermittent and continuous for landing |
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Name at least two items that may cause a takeoff warning horn to operate in a typical transport jet aircraft? |
Speed brakes,flaps, stabilizers,and auxiliary power exhaust door not in there takeoff position |
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When is the time to check landing gear switches,lights, and warning horns or buzzer for proper operation |
During an retraction check |
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What is the source of the anti skid warning system signal? |
The anti skid control unit |
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What type of landing gear warnings are provided for retractable landing gear systems? |
A horn or some other aural device and a red warning light |
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When does an aural device operate in a landing gear system? |
When the throttle is retarded and the landing gear is not down n locked |
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What size should a electric conduit should be used? |
25% larger then the maximum diameter of the wire bundle |
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What is the purpose of an annunaciator system? |
To display current condition and to notify of unsatisfactory conditions |
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What retractable landing gear position must be indicated? |
Down n lock Up n lock |
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What other aircraft systems may activate the landing gear warning system? |
The wing flap system |
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What system is used to indicate battery over temperature? |
A warning light |
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Ice and rain control systems |
IAR |
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What method are used to supply heat for thermal anti ice systems? |
Turbine compressor hot air,engine exhaust heat exchanger,and ram air heated by a combustion heater |
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How is the temperature maintained in a thermal anti ice system? |
By mixing heater air ambient (cold) air |
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What happens to the thermal anti icing airflow when it has heated a leading edge surface? |
The airflow is exhausted to the atmosphere |
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How can an electrically heated pitot tube with an ammeter installed in the system be checked for operation? |
It can be verified by noting the current consumption when the heater is turned on |
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What are two methods of inflating pneumatic deicer boots? |
An engine driven vacuum pump and bleed air from the turbine engine compressor |
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What should be done to a conduit end when fittings are not used? |
It should be deburred to prevent wire installation damage |
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What normally keeps the deice boots held down in flight? |
Suction is supplied in the boots during flights |
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What is the function of an oil separator used in some deice boots? |
In a wet type air pump,it is used to remove entrained oil from output air before it is sent through the boot system |
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How are deicer boots attached to the leading edge of the wing and tail surface? |
Bonding;fairing strips and screws, or a combination of both |
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What must be accomplished to a deice boot prior to a cold repair? |
Relieve the installed tension |
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What is the purpose of the electronic timer in a pneumatic deicer boot system? |
It control the operating time and sequence intervals |
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Why is a windshield rain repellent system not operate when the windshield is dry? |
Heavy undiluted repellent will restrict windows visibility |
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Name at least two methods that remove rain from windshield? |
Wiper,jet blast,chemical rain repellent |
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What powers windshield wiper system? |
Electrical or hydraulic power |
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What are two inherent problems associated with windshield wipers when operated in flight? |
Aerodynamic forces reduce blade pressure,failure to achieve fast enough wiper oscillation |
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How does a pneumatic rain removal system work? |
The air blast breaks the rain drops into small particles that are then blown away |
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What hardware is used to make bonding or grounding connections to a structure of dissimilar materials? |
A washer of suitable material should be used so that corrosion will occur on the washer |
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Fire protection systems |
FPS |
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Where are carbon monoxide detector usually used in aircraft? |
Cabins and cockpits |
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What are indications of excess carbon monoxide fumes when using CO testing? |
For chemical tabs, the tab changes color due to chemical reaction. More sophisticated detectors provide a digital output in parts per million carbon monoxide present or illuminated a light or an aural alarm sounds |
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What does a thermal switch fire detection system consist of? |
Heat sensitive units that complete electrical circuits at a certain temperatures |
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How is a thermal switch unit wired? |
Parallel wit each other and in series with the light |
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How is a thermocouple fire warning system different from a thermal switch system? |
A thermal switch works at a specific temperature whereas the thermocouple system depends on state of temperature rise |
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How are fenwal sensing elements wired? |
Connected in series with the unit |
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Describe a continuous loop detection system? |
One or more wires imbedded in a special ceramic core that changes its resistance with a change in temperature |
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How does a light refraction type (photoelectric) smoke detector warn of possible fire? |
Smoke in the air will cause the photoelectric cell to conduct an electric current |
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Name two types of smoke detection instruments used in aircraft? |
Photoelectric and ionization |
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How many terminal lugs can be put on a single terminal strip in an aircraft? |
Four |
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What are two types of installed fir extinguisher systems? |
Carbon dioxide and halon |
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What protection is provided for a fire extinguisher bottle in case of a temperature rise in excess of set limits? |
The agent dumps overboard ejecting a red thermal discharge indicator (disk) |
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What type of extinguishing agent is found in highly rate of discharge system? |
Halons |
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What procedure is used to check a fire extinguisher container for pressure? |
A chart must be used to determine minimum and maximum gauge readings based on the temperature |
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What is the purpose of a yellow disc in a fire extinguisher system? |
In indicates a normal system discharge |
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What indication may be caused by kinks and sharp bends in sensing elements of fire detection system? |
False fire warning,caused be shorts |
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How is the service life of a discharge cartridge calculated? |
From the manufacturer date stamped on the face of the cartridge |
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When should a switch be derated from its nominal rating? |
When used with high rush in circuits,inductive circuits,and direct current motors |
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When do DC draw several times there rated current? |
When starting |
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When is a circuit breaker designed to open? |
When an overload or circuit faults exists |
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What type of circuit breaker not be used in aircraft? |
Automatic resetting type |
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What color is a left wingtip position light? |
Red |
