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11 Aircraft Instrume
11 Aircraft Instrument Systems
| Question | Answer |
|---|---|
| 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? | Altimeter. |
| Resistance-type temperature indicators using Wheatstone bridge or ratiometer circuits may be used to indicate the temperatures of which of the following? | Free air, carburetor air, coolant (engine), and oil temperature. |
| Where may a person look for the information necessary to determine the required markings on an engine instrument? | Aircraft flight manual or aircraft maintenance manual. |
| A barometric altimeter indicates pressure altitude when the barometric scale is set at | 29.92 "Hg. |
| What is the fixed line mark attached to the compass bowl of a magnetic compass called? | Lubber line. |
| A radar altimeter indicates | altitude above ground level. |
| Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics? | Deviation |
| An aircraft magnetic compass is swung to up-date the compass correction card when | equipment is added that could effect compass deviation. |
| 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. |
| An aircraft instrument panel is electrically bonded to the aircraft structure to | provide current return paths. |
| The requirements for testing and inspection of instrument static systems required by 14 CFR 91.411 are contained in | Part 43, appendix E. |
| How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine inoperative)? | A blue radial line. |
| 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. |
| Which of the following instrument discrepancies could be corrected by an aviation mechanic? | Red line missing, mounting screws loose, case paint chipped, or leaking at line B nut. |
| Fuel flow transmitters are designed to transmit data | electrically. |
| A turn coordinator instrument indicates | both roll and yaw. |
| 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. |
| When installing an instrument in an aircraft, who is responsible for making sure it is properly marked? | The mechanic installing the instrument. |
| Data transmitted between components in an EFIS are converted into | digital signals. |
| Which of the following will cause inaccuracies in a magnetic compass that may be compensated for by an aircraft mechanic? | Deviation |
| Which of the following instrument discrepancies would require replacement of the instrument? | Case leaking, glass cracked, instrument will not zero out, or fogged. |
| Which instruments are connected to an aircraft's static pressure system only? | Vertical speed indicator and altimeter. |
| The green arc on an aircraft temperature gauge indicates | the desirable temperature range. |
| When an aircraft altimeter is set at 29.92 "Hg on the ground, the altimeter will read | pressure altitude. |
| The method of mounting aircraft instruments in their respective panels depends on the | design of the instrument case. |
| Aircraft instrument panels are generally shock-mounted to absorb | low-frequency, high-amplitude shocks. |
| A certificated mechanic may perform | 100-hour inspections of instruments. |
| A certificated mechanic with airframe and powerplant ratings may | not perform repairs to aircraft instruments. |
| Instrument panel shock mounts absorb | low-frequency, high-amplitude shocks. |
| What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating? | The existing atmospheric pressure. |
| The maximum deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certificated under 14 CFR Part 23 is | 10 |
| 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. |
| 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. |
| Which condition would be most likely to cause excessive vacuum in a vacuum system? | Vacuum relief valve improperly adjusted. |
| Which of the following instruments will normally have range markings? | Cylinder head temperature gauge and airspeed indicator. |
| A certificated mechanic with at least an airframe rating may perform | inspections and function checks on aircraft instruments. |
| 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. |
| When performing the static system leakage check required by 14 CFR 91.411, the technician utilizes | negative pressure. |
| Which procedure should you use if you find a vacuum-operated instrument glass loose? | Install another instrument. |
| The function of a CRT in an EFIS is to | display alphanumeric data and representations of aircraft instruments. |
| Which of the following operating mechanisms would be found in a hydraulic pressure gauge? | Bourdon tube. |
| 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. |
| Aircraft temperature thermocouple leads may | not be altered and are designed for a specific installation. |
| Turbine engine exhaust gas temperatures are measured by using | chromel/alumel thermocouples. |
| Magnetic compass bowls are filled with a liquid to | dampen the oscillation of the float. |
| Who is authorized to repair an aircraft instrument? | A certificated repair station approved for that class instrument. |
| Cases for electrically operated instruments are made of | Iron or steel cases. |
| A synchro transmitter is connected to a synchro receiver | electrically with wires. |
| Which instrument condition is acceptable and would not require correction? | Case paint chipped. |
| 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. |
| 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. |
| A radar altimeter determines altitude by | transmitting a signal and receiving back a reflected signal. |
| Aircraft instrument value should be marked and graduated in accordance with | the specific aircraft maintenance or flight manual. |
| The lubber line on a directional gyro is used to | represent the nose of the aircraft. |
| A Bourdon tube instrument may be used to indicate | pressure and temperature. |
| The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check is | 100 feet in 1 minute. |
| The red radial lines on the face of an engine oil pressure gauge indicates | minimum and/ or maximum safe operating limits. |
| Which instruments are connected to an aircraft's pitot-static system? | Vertical speed indicator, altimeter, and airspeed indicator. |
| When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is | that function is inoperative. |
| At sea level, when the average atmospheric pressure is 14.7 psi, the barometric pressure is | 29.92 "Hg. |
| What marking color is used to indicate if a cover glass has slipped? | White. |
| 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. |
Created by:
Jack Mollohan