Aircraft Instrument Flashcards
An aircraft magnetic compass is swung to up-date the compass correction card when
Equipment is added that could effect compass deviation
The operating mechanism of most hydraulic pressure gauges is
Bourdon tube
What is the fixed line mark attached to the compass bowl of a magnetic compass called?
Lubber line
(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 1 is true
When swinging a magnetic compass, the compensators are adjusted to correct for
Magnetic influence deviation
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
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 degrees
Magnetic compass bowls are filled with a liquid to
Dampen the oscillation of the float
The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system
integrity check is
100 feet in 1 minute
Which statement regarding an aircraft instrument vacuum system is true?
Dry type vacuum pump with carbon vanes are very susceptible to damage from solid airborne
particles and must take in only filtered air
When an aircraft altimeter is set at 29.92” Hg on the ground, the altimeter will read
Pressure altitude
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
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
Which of the following instrument conditions 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
A barometric altimeter indicates pressure altitude when the barometric scale is set at
29.92” hg
A Bourdon tube instrument may be used to indicate
1. pressure.
2. temperature.
3. position.
1 and 2
A turn coordinator instrument indicates
Both roll and yaw
Thermocouple leads
Are designed for specific installation and may not be altered
A synchro transmitter is connected to a synchro receiver
Electrically with wires
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
Turbine engine exhaust gas temperatures are measured by using
Chromel/alumel thermocouples
Fuel flow transmitters are designed to transmit data
Electrically
Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by
mechanics?
Deviation
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
What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating?
The existing atmospheric pressure
The requirements for testing and inspection of instrument static systems required by Section 91.411 are
contained in
PART 43, APPENDIX E
Which condition would be most likely to cause excessive vacuum in a vacuum system?
Vacuum relief valve improperly adjusted
Data transmitted between components in an EFIS are converted into
Digital signal
The function of a CRT in an EFIS is to
Display alphanumeric data and representations of aircraft instruments
The function of a symbol generator (SG) in an EFIS is to
Receive and process input signals from a/c and engine sensors and sent the data to the appropriate display
A radar altimeter determines altitude by
Transmitting a signal and receiving bask a reflected signal
A radar altimeter indicates
Altitude above ground level
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
When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is
That function is inoperative
Instrument panel shock mounts absorb
Low frequency ,high amplitude shocks
Which procedure should you use if you find a vacuum-operated instrument glass loose?
Install another instrument
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
How many of the following instruments will normally have range markings?
1. Airspeed indicator.
2. Altimeter.
3. Cylinder head temperature gauge.
Two
How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine
inoperative)?
Blue radial line
The green arc on an aircraft temperature gauge indicates
Desirable temperature range
What must be done to an instrument panel that is supported by shock mounts?
Bonding straps must be install across the instrument mounts as a current path
What marking color is used to indicate if a cover glass has slipped?
White
Aircraft instruments should be marked and graduated in accordance with
The specific aircraft maintenance or flight manual
Aircraft instrument panels are generally shock-mounted to absorb
Low frequency, high amplitude shocks
The method of mounting aircraft instruments in their respective panels depends on the
Design of the instrument case
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 panel
Cases for electrically operated instruments are made of
Iron or steel cases
When installing an instrument in an aircraft, who is responsible for making sure it is properly marked?
Instrument installer
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 or 4
A certificated mechanic with airframe and powerplant ratings may
Not perform repairs to aircraft instruments
The red radial lines on the face of an engine oil pressure gauge indicates
Minimum or maximum safe operating limits
A certificated mechanic may perform
100 hour inspection of instruments
An aircraft instrument panel is electrically bonded to the aircraft structure to
Provide current return paths
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
The lubber line on a directional gyro is used to
Represents the nose of the aircraft
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
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
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
When performing the static system leakage check required by Section 91.411, the technician utilizes
Negative Pressure
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 prescribe equivalent
altitude to be indicated
