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Airframe Writtens > Aircraft Instrument Systems > Flashcards

Aircraft Instrument Systems Flashcards

1
Q

An aircraft magnetic compass is swung to update the compass correction card when what?

A

equipment is added that could effect compass deviation.

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2
Q

Which of the following operating mechanisms would be found in a hydraulic pressure gauge?

A

Bourdon tube.

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3
Q

What is the fixed line mark attached to the compass bowl of a magnetic compass called?

A

Lubber line.

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4
Q

Which of the following will cause inaccuracies in a magnetic compass that may be compensated for by an aircraft mechanic?

A

Deviation.

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5
Q

What will be the result if the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight?

A

The altimeter and airspeed indicator will both read low.

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6
Q

The maximum deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certificated under 14 CFR Part 23 is what?

A

10 Degrees.

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7
Q

Magnetic compass bowls are filled with a liquid to what?

A

Dampen the oscillation of the float.

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8
Q

Instrument static system leakage can be detected by observing the rate of change in indication of the what?

A

altimeter after suction has been applied to the static system to cause a prescribed equivalent altitude to be indicated.

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9
Q

The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check is what?

A

100 feet in 1 minute.

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10
Q

Which statement regarding an aircraft instrument vacuum system is true?

A

Dry-type vacuum pumps with carbon vanes are very susceptible to damage from solid airborne particles and must take in only filtered air.

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11
Q

When an aircraft altimeter is set at 29.92 “Hg on the ground, the altimeter will read what?

A

pressure altitude.

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12
Q

Which of the following instrument discrepancies would require replacement of the instrument?

A

Case leaking, glass cracked, instrument will not zero out, or fogged.

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13
Q

Which instrument condition is acceptable and would not require correction?

A

Case paint chipped.

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14
Q

A barometric altimeter indicates pressure altitude when the barometric scale is set at what?

A

29.92 “Hg.

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15
Q

At sea level, when the average atmospheric pressure is 14.7 psi, the barometric pressure is what?

A

29.92 “Hg.

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16
Q

A Bourdon tube instrument may be used to indicate what?

A

Pressure and temperature.

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17
Q

A turn coordinator instrument indicates what?

A

Both roll and yaw.

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18
Q

Aircraft temperature thermocouple leads may what?

A

Not be altered and are designed for a specific installation.

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19
Q

A synchro transmitter is connected to a synchro reciever how?

A

Electrically with wires.

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20
Q

The operation of an angle of attack indicating system is based on detection of differential pressure at a point where the airstream flows in a direction…

A

not parallel to the true angle of attack of the aircraft.

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21
Q

Turbine engine exhaust gas temperatures are measured by using what?

A

chromel/alumel thermocouples.

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22
Q

Fuel flow transmitters are designed to transmit data how?

A

electrically.

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23
Q

Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics?

A

Deviation.

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24
Q

Who is authorized to repair an aircraft instrument?

A

A certificated repair station approved for that class instrument.

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25
Q

A certificated mechanic with at least an airframe rating may perform what?

A

Inspections and function checks on aircraft instruments.

26
Q

What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating?

A

The existing atmosphere pressure.

27
Q

The requirements for testing and inspection of instrument static pressure systems required by 14 CFR 91.411 are contained in what?

A

Part 43, appendix E.

28
Q

Which condition would be most likely to cause excessive vacuum in a vacuum system?

A

Vacuum relief valve improperly adjusted.

29
Q

Data transmitted between components in an EFIS are converted into what?

A

Digital signals.

30
Q

The function of a CRT in an EFIS is to what?

A

Display alphanumeric data and representations of aircraft instruments.

31
Q

The function of a symbol generator (SG) in an EFIS is to what?

A

Receive and process input signals from aircraft and engine sensors and send the data to the appropriate display.

32
Q

The function of a display controller in an EFIS is to what?

A

Allow the pilot to select the appropriate system configuration for the current flight situation.

33
Q

A radar altimeter determines altitude by what?

A

transmitting a signal and receiving back a reflected signal.

34
Q

A radar altimeter indicates what?

A

altitude above ground level.

35
Q

Resistance-type temperature indicators using Wheatstone bridge or ratiometer circuits may be used to indicate the temperatures of which of the following?

A

Free air, carburetor air, coolant (engine), and oil temperature.

36
Q

When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is what?

A

that function is inoperative.

37
Q

Instrument panel shock mounts absorb what?

A

low-frequency, high-amplitude shocks.

38
Q

Which procedure should you use if you find a vacuum-operated instrument glass loose?

A

Install another instrument.

39
Q

Which instrument are connected to an aircraft’s pitot-static system?

A

Vertical speed indicator, altimeter, and airspeed indicator.

40
Q

Which of the following instruments will normally have range markings?

A

Cylinder head temperature gauge and airspeed indicator.

41
Q

How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine inoperative)?

A

A blue radial line.

42
Q

The green arc on an aircraft temperature gauge indicates what?

A

The desirable temperature range.

43
Q

What must be done to an instrument panel that is supported by shock mounts?

A

Bonding straps must be installed across the instrument mounts as a current path.

44
Q

What marking color is used to indicate if a cover glass has slipped?

A

White.

45
Q

Aircraft instruments should be marked and graduated in accordance with what?

A

The specific aircraft maintenance or flight manual.

46
Q

Aircraft instrument panels are generally shock-mounted to absorb what?

A

Low-frequency, high-amplitude shocks.

47
Q

The method of mounting aircraft instruments in their respective panels depends on the what?

A

Design of the instrument case.

48
Q

How is a flangeless instrument case mounted in an instrument panel?

A

By an expanding-type clamp secured to the back of the panel and tightened by a screw from the front of the instrument panel.

49
Q

Cases for electrically operated instruments are made of what?

A

Iron or steel cases.

50
Q

When installing an instrument in an aircraft, who is responsible for making sure it is properly marked?

A

The mechanic installing the instrument.

51
Q

Where may a person look for the information necessary to determine the required markings on an engine instrument?

A

Aircraft flight manual or aircraft maintenance manual.

52
Q

A certificated mechanic with airframe and powerplant ratings may what?

A

not perform repairs to aircraft instruments.

53
Q

The red radial lines on the face of an engine oil pressure gauge indicates what?

A

minimum and/or maximum safe operating limits.

54
Q

A certificated mechanic may perform what?

A

100-hour inspections of instruments.

55
Q

An aircraft instrument panel is electrically bonded to the aircraft structure to what?

A

Provide current return paths.

56
Q

How many of the following are controlled by gyroscopes?

A

Three.

Attitude indicator
Heading indicator
Turn needle of the turn-and-slip indicator

57
Q

The lubber line on a directional gyro is used to what?

A

Represent the nose of the aircraft.

58
Q

Which instruments are connected to an aircraft’s static pressure system only?

A

Vertical speed indicator and altimeter.

59
Q

When an unpressurized aircraft’s static pressure system is leak checked to comply with the requirements of 14 CFR 91.411, what aircraft instrument may be used in lieu of a pitot-static system tester?

A

Altimeter.

60
Q

If a static pressure system check reveals excessive leakage, the leak(s) may be located by what?

A

Isolating portions of the line and testing each portion systematically starting at the instrument connections.

61
Q

When performing the static system leakage check required by 14 CFR 91.411, the technician utilizes what?

A

Negative pressure.

62
Q

Which of the following aircraft instrument discrepancies could be corrected by an aviation mechanic?

A

Red line missing, mounting screws loose, case paint chipped, or leaking at line B nut.

Airframe Writtens (34 decks)

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