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26 Cards in this Set
- Front
- Back
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What types of repairs or alterations can a certificated A&P mechanic make to aircraft instruments? |
None. Only FAA-approved repair stations can make repairs or alterations on a particular instrument |
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What is the significance of a red radial line on a dial of an aircraft instrument? |
It marks a never exceed condition |
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What is the significance of a yellow Arc on the dial of an aircraft instrument? |
It marks a caution range of operation |
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What instruments in an aircraft are connected to the static system? |
Airspeed indicator, vertical indicator, and the altimeter |
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What is the significance of a green arc on the dial of an aircraft instrument? |
It Indicates the normal range of operation |
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What is the significance of the white arc on the dial of an airspeed indicator? |
It indicates the Airspeed at which the flaps maybe lowered |
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What is used to warn a mechanic that the glass on an aircraft instrument that contains the range marks has slipped? |
Slippage mark on the lower part of the instrument cover |
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Where can the mechanic find the range markings that are required on the instruments in a particular aircraft? |
The type certificate data sheet for that aircraft |
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What check must be made if a mechanic replaces any instrument that is connected to the instrument static system? |
A test to check for leaks |
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Why are many of the electrical instruments mounted in steel cases? |
To concentrate the flux produced by magnets in the instruments and keeps it from affecting other nearby instruments |
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Why must an aircraft instrument panel be electrically bonded to the primary aircraft structure? |
To act as a ground for the instrument |
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What is corrected when an aircraft compass is swung? |
Deviation error |
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What fluid is used in an aircraft magnetic compass? |
Special water-clear fluid, similar to kerosine |
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What is the maximum amount of deviation error that is allowed when a magnetic compass is installed in an aircraft? |
10 degrees |
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What is the maximum amount of leakage that is allowed when checking the static system of an aircraft that is operated under instrument flight rules? |
Not more than 100 feet per minute in an unpressurized aircraft system Not more than 2% of the equivalent altitude of the maximum differential pressure or 100 feet whichever is greater in a pressurized aircraft system |
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Why must the length of the thermocouple not be altered when installing cylinder head temperature indicator? |
Because it's a current measuring device and the resistance of the thermocouple and its leads must be kept at the specified value for the indicator |
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What should a manifold pressure gauge read when the engine is not operating? |
Existing barometric pressure |
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What is the difference between a 2-minute and a 4 minute turn and slip indicator? |
2 minute turn indicator gives 1 needle width deflection for standard rate of turn or three degrees per second. 4 minute indicator gives a 1/2 needle deflection for a standard rate of turn or 1and a 1/2 half degrees per second |
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What is the difference between a turn and slip indicator and a turn coordinator? |
The turn and slip indicator is sensitive about the yaw or vertical axis only, the turn coordinator uses a canted gyro which makes it sensitive about both the roll and yaw axis |
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What is used as a sensor in the fuel tank for electronic type fuel quantity indicating system? |
Tabular capacitors extending across the fuel tank from top to bottom |
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Why is a dual tachometer used on a single-engine helicopter |
So that one indicates the speed of the engine and the other the speed of the main rotor |
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In what units is the Tachometer used on a turbine engine calibrated? |
In a percentage of take off RPM |
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What kind of systems is used to measure the exhaust gas temperature of a turbine engine? |
An averaging system made up of a series of thermocouples arranged around the inside of the exhaust duct of the engine |
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What would likely cause the needle of an electrical oil temperature gauge to peg on the high side of the instrument dial? |
An open in the bulb circuit causing the instrument to see an infinite resistance |
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What is used as a flowmeter for most of the small horizontally opposed fuel injected aircraft engines? |
A pressure gauge to measure pressure drop across the injector nozzles |
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What two sources of power are used to operate the gyro instrument in an aircraft? |
Pnuematic powered by suction or pressure or electrically powered |
