Aircraft Instrument Systems

Question 1

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

Answer 1

The lubber line

Question 2

No.1 Aircraft instruments are color-coded to direct attention to operational ranges and limitations

Answer 2

Only No.1 is true

Question 3

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

Answer 3

Deviation

Question 4

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

Answer 4

Altimeter and airspeed indicator will indicate low

Question 5

The max deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certified under part FAR 23 is

Answer 5

10 degrees

Question 6

Magnetic compass bowls are filled with a liquid to

Answer 6

dampen the oscillation of the float

Question 7

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

Answer 7

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

Question 8

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

Answer 8

100 feet in 1 min

Question 9

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

Answer 9

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

Question 10

Which of the follow instrument conditions is acceptable and would not require correction?

Answer 10

Case paint chipped

Question 11

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

Answer 11

29.92” Hg

Question 12

A bourdon tube instrument may be used to indicate

Answer 12

pressure and temperature

Question 13

A turn coordinator instrument indicates

Answer 13

both roll and yaw

Question 14

Aircraft temperature thermocouple leads may

Answer 14

not be altered and are designed for a specific installation

Question 15

A synchro transmitter is connected to a synchro receiver

Answer 15

electrically with wires

Question 16

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

Answer 16

not parallel to the true angle of attack of the aircraft

Question 17

Turbine engine exhaust gas temperature are measured by using

Answer 17

chrome/alumel thermocouples

Question 18

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

Answer 18

Deviation

Question 19

Who is authorised to repair an aircraft instrument?

Answer 19

A certificated repair station approved for that class instrument

Question 20

A certificated mechanic with at least an airframe rating may perform

Answer 20

inspections and function check on aircraft instruments

Question 21

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

Answer 21

The existing atmospheric pressure

Question 22

The requirements for testing and inspection of instruments static systems required by (FAR) 14 CFR Section 91.411 are contained in

Answer 22

(FAR) 14 CFR Part 43, appendix E

Question 23

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

Answer 23

Vacuum relief valve improperly adjusted

Question 24

Data transmitted between components in an EFIS are converted into

Answer 24

digital signals

Question 25

The function of a CRT (Cathode Ray Tube) in an EFIS is to

Answer 25

display alphanumeric data and representations of aircraft instruments

Question 26

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

Answer 26

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

Question 27

The function of a display controller in an EFIS is to

Answer 27

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

Question 28

A radar altimeter determines altitude by

Answer 28

transmitting a signal and receiving back a reflected signal

Question 29

A radar altimeter indicates

Answer 29

altitude above ground level

Question 30

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

Answer 30

Free air, carburetor air, coolant (engine), and oil temp

Question 31

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

Answer 31

that function is INOP

Question 32

Instrument panel shock mounts absorb

Answer 32

low frequency, high-amplitude shocks

Question 33

What determines the number of shock mounts that need to be installed on an instrument panel?

Answer 33

Weight of the complete panel

Question 34

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

Answer 34

Install another instrument

Question 35

Which of the following instruments will normally have range markings?

Answer 35

Cylinder head temp gauge and airspeed indicator

Question 36

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

Answer 36

A blue radial line

Question 37

The green arc on an aircraft temperature gauge indicates

Answer 37

the desirable temperature range

Question 38

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

Answer 38

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

Question 39

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

Answer 39

White

Question 40

Aircraft instrument should be marked and graduated in accordance with

Answer 40

the specific aircraft maintenance or flight manual

Question 41

Aircraft instrument panels are generally shock mounted to absorb

Answer 41

low frequency, high amplitude shocks

Question 42

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

Answer 42

design on the instrument case

Question 43

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

Answer 43

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

Question 44

Cases for electrically operated instruments are made of

Answer 44

Iron or steel cases

Question 45

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

Answer 45

The mechanic installing the instrument

Question 46

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

Answer 46

Aircraft flight manual or aircraft maintenance manual

Question 47

A certificated mechanic with airframe and powerplant ratings may

Answer 47

not perform repair to aircraft instruments

Question 48

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

Answer 48

minimum and/or maximum safe operating limits

Question 49

A certificated mechanic may perform

Answer 49

100-hour inspections of instruments

Question 50

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

Answer 50

provide current return paths

Question 51

How many of the following are controlled by gyroscopes? 1. Altitude indicator 2. Heading indicator 3. Turn needle of the turn and slip indicator

Answer 51

Three

Question 52

The lubber line on a directional gyro is used to

Answer 52

represent the nose of the aircraft

Question 53

Which instruments are connected to an aircrafts static pressure system only?

Answer 53

Vertical speed indicator and altimeter

Question 54

When an unpressurized aircraft static pressure system is leak checked to comply with the requirements of (FAR) 14 CFR Section 91.411, what aircraft instrument may be used in lieu of pitot-static system tester

Answer 54

Altimeter

Question 55

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

Answer 55

isolating portions of the line and testing each portion systemically, starting at the instrument connections

Question 56

When performing the static system leakage check required by (FAR) 14 CFR Section 91.411, the technician utltizes

Answer 56

negative pressure

Question 57

What is the primary purpose of an autopilot?

Answer 57

To relieve the pilot of control of the aircraft during long periods of flight

Question 58

Which of the following provides manual maneuverability of the aircraft while the autopilot is engaged?

Answer 58

Flight controller

Question 59

In an autopilot, which signal nullifies the input signal to the ailerons?

Answer 59

Follow up signal

Question 60

In which control element of an autopilot system is an altitude indicator?

Answer 60

Sensing

Question 61

What is the operating principle of the sensing device used in an autopilot system?

Answer 61

The relative motion between a gyro and its supporting system

Question 62

What will occur if an aircraft altitude is changed by its autopilot system in order to correct for an error and the involved control surfaces are returned to streamline by the time aircraft has reached its correct position?

Answer 62

Normal operation

Question 63

What component of an autopilot system applies torque to the control surfaces of an aircraft?

Answer 63

Servo

Question 64

What is the main purpose of a servo in autopilot system?

Answer 64

Move the control surface as commanded

Question 65

Which channel of an autopilot detects changes in pitch attitude of an aircraft?

Answer 65

Elevator

Question 66

The elevator channel of an autopilot controls the aircraft about which axis of rotation?

Answer 66

Lateral

Question 67

What component is the sensing device in an electromechanical autopilot system?

Answer 67

Gyro

Question 68

A fully integrated autopilot controls the aircraft around how many axis?

Answer 68

Three

Question 69

Dutch roll, a combination of yawing and rolling oscillation that affects many swept wing aircraft, is counteracted with

Answer 69

yaw damper system

Question 70

When operationally checking an autopilot system on the ground, after the aircraft's main power has been switched on, the autopilot should be engaged

Answer 70

only after the gyros comes up to speed and the amplifier warms up