Aircraft Instrument Systems, FAA Airframe Prepware

(8622) Instrument panel shock mounts absorb

low frequency, high-amplitude shocks

(8586) An aircraft magnetic compass is swung to up-date the compass correction card when

equipment is added that could effect compass deviation.

(8607) Turbine engine exhaust gas temperatures are measured by using

chromel/alumel thermocouples.

(8612) The requirements for testing and inspection of instrument static systems required by Section 91.411 are contained in

Part 43, appendix E.

(8593) Magnetic compass bowls are filled with a liquid to

dampen the oscillation of the float.

(8609) Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics?

Deviation

(8629) What marking color is used to indicate if a cover glass has slipped?

White

(8643) Which instruments are connected to an aircraft's static pressure system only?

1. Vertical speed indicator!

2. Cabin altimeter.

3. Altimeter!

4. Cabin rate-of-change indicator.

5. Airspeed indicator.

1 and 3

(8587) Which of the following operating mechanisms would be found in a hydraulic pressure gauge?

Bourdon tube.

(8614) Data transmitted between components in an EFIS are converted into

digital signals.

(8605) A synchro transmitter is connected to a synchro receiver

electrically with wires.

(8611) What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating?

The existing atmospheric pressure.

(8636) Where may a person look for the information necessary to determine the required markings on an engine instrument?

1. Engine manufacturer's specifications.

2. Aircraft flight manual!

3. Instrument manufacturer's specifications.

4. Aircraft maintenance manual!

2 and 4, (2 Aircraft flight manual and 4 Aircraft maintenance manual)

(8603) A turn coordinator instrument indicates

both roll and yaw.

(8641) How many of the following are controlled by gyroscopes?

1. Attitude indicator.

2. Heading indicator.

3. Turn needle of the turn-and-slip indicator.

Three

(8588) What is the fixed line mark attached to the compass bowl of a magnetic compass called?

Lubber line.

(8635) When installing an instrument in an aircraft, who is responsible for making sure it is properly marked?

The mechanic installing the instrument

(8610) Who is authorized to repair an aircraft instrument?

1. A certified mechanic with an airframe rating.

2. A certificated repairman with an airframe rating.

3. A certificated repair station approved for that class instrument!

4. A certificated airframe repair station.

3

A certificated repair station approved for that class instrument.

(8594) Instrument static system leakage can be detected by observing the rate of change in indication of the

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

(8619) A radar altimeter indicates

altitude above ground level.

(8620) Resistance-type temperature indicators using Wheatstone bridge or ratiometer circuits may be used to indicate the temperatures of which of the following?

1. Free air!

2. Exhaust gas temperature.

3. Carburetor air!

4. Coolant (engine)!

5. Oil temperature!

6. Cylinder head temperature.

1, 3, 4, and 5.

(8633) How is a flangeless instrument case mounted in an instrument panel?

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

(8589) 1 Aircraft instruments are color-coded to direct attention to operational ranges and limitations.

2 Aircraft instruments range markings are not specified by Title 14 of the Code of Federal Regulations but are standardized by aircraft manufacturers.

Regarding the above statements,

only No. 1 is true.

(8628) What must be done to an instrument panel that is supported by shock mounts?

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

(8630) Aircraft instrument value should be marked and graduated in accordance with

the specific aircraft maintenance or flight manual

(8640) An aircraft instrument panel is electrically bonded to the aircraft structure to

provide current return paths.

(8616) The function of a symbol generator (SG) in an EFIS is to

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

(8644) When an unpressurized aircraft's static pressure system is leak checked to comply with the requirements of Section 91.411, what aircraft instrument may be used in lieu of a pitot-static system tester?

1. Vertical speed indicator.

2. Cabin altimeter.

3. Altimeter!

4. Cabin rate-of-change indicator.

5. Airspeed indicator.

3

(8601) A barometric altimeter indicates pressure altitude when the barometric scale is set at

29.92" Hg

(8642) The lubber line on a directional gyro is used to

represent the nose of the aircraft.

(8598) Which of the following instrument discrepancies could be corrected by an aviation mechanic?

1. Red line missing!

2. Case leaking.

3. Glass cracked.

4. Mounting screws loose!

5. Case paint chipped!

6. Leaking at line B nut!

7. Will not adjust.

8. Fogged.

1, 4, 5, 6.

(8695) The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check is

100 feet in 1 minute.

(8608) Fuel flow transmitters are designed to transmit data

electrically

(8618) A radar altimeter determines altitude by

transmitting a signal and receiving back a reflected signal.

(8626) How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine inoperative)?

A blue radial line.

(8617) The function of a display controller in an EFIS is to

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

(8604) Aircraft temperature thermocouple leads may

not be altered and are designed for a specific installation.

(8597) When an aircraft altimeter is set at 29.92" Hg on the ground, the altimeter will read

pressure altitude.

(8615) The function of a CRT in an EFIS is to

display alphanumeric data and representations of aircraft instruments.

(8637) A certificated mechanic with airframe and powerplant ratings may

not perform repairs to aircraft instruments.

(8639) A certificated mechanic may perform

100-hour inspections of instruments.

(8623) Which procedure should you use if you find a vacuum-operated instrument glass loose?

Install another instrument.

(8625) Which of the following instruments will normally have range markings?

Cylinder head temperature gauge, airspeed indicator.

(8596) Which statement regarding an aircraft instrument vacuum system is true?

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

(8600) Which instrument condition is acceptable and would not require correction?

1. Red line missing.

2. Case leaking.

3. Glass cracked.

4. Mounting screws loose.

5. Case paint chipped!

6. Leaking at line B nut.

7. Will not zero out.

8. Fogged.

5 Case paint chipped

(8638) The red radial lines on the face of an engine oil pressure gauge indicates

minimum and/ or maximum safe operating limits.

(8591) What will be the result if the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight?

The altimeter and airspeed indicator will both read low.

(8602) A Bourdon tube instrument may be used to indicate

1. pressure.

2. temperature.

3. position.

1 and 2

(8632) The method of mounting aircraft instruments in their respective panels depends on the

design of the instrument case.

(8590) Which of the following will cause inaccuracies in a magnetic compass that may be compensated for by an aircraft mechanic?

Deviation.

(8624) Which instruments are connected to an aircraft's pitot-static system?

1. Vertical speed indicator.

2. Cabin altimeter.

3. Altimeter.

4. Cabin rate-of-change indicator.

5. Airspeed indicator.

1, 3, and 5.

(8645) If a static pressure system check reveals excessive leakage, the leak(s) may be located by

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

(8631) Aircraft instrument panels are generally shock-mounted to absorb

low-frequency, high-amplitude shocks.

(8634) Cases for electrically operated instruments are made of

Iron or steel cases

(8592) The maximum deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certificated under Federal Aviation Regulation Part 23 is

10°.

(8627) The green arc on an aircraft temperature gauge indicates

the desirable temperature range.

(8606) 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

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

(8646) When performing the static system leakage check required by Section 91.411, the technician utilizes

negative pressure.

(8621) When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is

that function is inoperative.

(8599) Which of the following instrument discrepancies would require replacement of the instrument?

1. Red line missing.

2. Case leaking!

3. Glass cracked!

4. Mounting screws loose.

5. Case paint chipped.

6. Leaking at line B nut.

7. Will not zero out!

8. Fogged!

2, 3, 7, 8

(8613) Which condition would be most likely to cause excessive vacuum in a vacuum system?

Vacuum relief valve improperly adjusted.

(8601-1) At sea level, when the average atmospheric pressure is 14.7 PSI, the barometric pressure is

29.92 Mb.

(8610-1) A certificated mechanic with at least an airframe rating may perform

inspections and function checks on aircraft instruments.