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32 Cards in this Set
- Front
- Back
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In what units is the tachometer for a reciprocating engine calibrated? |
In hundreds of RPM. |
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In what units is the tachometer for a turbine engine calibrated? |
In percent of the engine's rated takeoff RPM. |
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Where does the manifold pressure gage used on an aircraft reciprocating engine pick up the pressure it measures?
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From the intake manifold of the engine. |
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What are two types of pickups used for measuring the cylinder head temperature of a reciprocating engine?
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Thermocouple type Bayonet Type |
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What is used to measure the fuel flow of a horizontally opposed, fuel–injected reciprocating engine?
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A pressure gage that measures across injector nozzles. |
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What is indicated if the needle of a ratiometer–type oil temperature indicator pegs to the high side of the dial as soon as the aircraft master switch is turned on? |
There is an open in the bulb circuit that causes the instrument to see an infinite resistance. |
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What type of indicating system is used to measure the exhaust gas temperature of a turbine engine?
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Thermocouple type |
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What should a thermocouple–type cylinder head temperature indicator read when the engine is not operating?
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The temperature of the outside air. |
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Of what two materials are the thermocouples made that are used in a turbine engine exhaust gas temperature system?
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Chromel and alumel. |
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What kind of mechanism is normally used to measure oil pressure in a reciprocating engine?
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A bourdon tube mechanism.
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What is measured by the tachometers used on a two–spool gas turbine engine?
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The N1 tachometer shows the RPM of the low–pressure compressor N2 tachometer shows the RPM of the high–pressure compressor. |
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Does the tachometer of a geared reciprocating engine indicate the speed of the crank shaft or of the propeller shaft?
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The speed of the crankshaft.
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What are three types of flow–indicating systems used for turbine engines?
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Vane–type Synchronous mass–type Electronic motorless |
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What do mass flow systems measure?
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The density of the fuel which is affected by the fuel temp. |
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In what units is an electronic motorless mass flow meter system calibrated?
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Pounds per hour of fuel flow |
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Who is authorized to repair a fuel flow indicating system?
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Only repaired by an FAA approved repair station certificated for the particular instruments |
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Where can you find the electrical power requirements for a fuel flow indicating system?
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Aircraft maintenance manual |
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Where in the fuel system is the fuel flow transmitter located?
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Between the fuel control and the fuel nozzles
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What kind of indicating system is used to measure oil temp in a small, single–engine, general aviation airplane?
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oil temp bulb inside the strainer. |
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What kind of electrical instrument system is used for measuring oil temp?
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Ratiometer |
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What is critical in the installation of the thermocouple leads for a cylinder–head temp indicator, the length of the leads or their resistance?
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Resistance is critical |
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What should a ratiometer temp indicator read when the electrical power is off?
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Pointer should be off scale on the low side
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What kind of tach is used on small airplanes?
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Magnetic drag tach |
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What would likely cause the pointer of a magnetic drag tach to oscillate?
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A kink in the cable housing |
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Is it permissible for a mechanic with a A&P to replace the tach cable for a magnetic drag tach?
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Yes, this does not constitute a repair to an instrument |
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What kind of tach is used on most large multi–engine airplanes?
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Three–phase AC electric tach
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What kind of indicator mechanism is used to measure manifold pressure?
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Differential bellows |
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What should a manifold pressure gage read when the engine is not operating?
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Existing barometric pressure |
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What is used to fill the line between a fuel pressure gage and the fuel metering system? |
Fluid similar to kerosine |
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What could cause a fuel pressure gage to fluctuate?
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The loss of the light oil in the line between the gage and the engine |
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Is a certificated mechanic with an A&P allowed to zero the pointers on a fuel pressure gage?
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No, a mechanic is not allowed to make any repairs or alterations to an aircraft instrument |
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How does a ratiometer–type oil temp gage measure the temp of the oil?
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It measures the resistance of the temp bulb. |
