Airframe Systems & Components: Aircraft Instrument Systems 🔊 Flashcards
What three flight instruments are normally operated from the pitot static system?
Airspeed indicator, altimeter, and vertical speed indicator
What instrument indications will result if the static pressure line becomes disconnected inside the cabin of a pressurized aircraft?
The altimeter and airspeed indications will be lower than normal. The vertical speed indicator will indicate momentary descent then return to zero
Who is authorized to perform tests to calibrate an altimeter?
The manufacturer or a certified repair station
What is required after replacement of components connected to the pitot static system?
A leak test is required
In wet-type vacuum pumps, what are the vanes made from?
Steel
How are vanes of a wet-type pump lubricated?
Engine oil
What are the sources of power to gyroscopic instrument operation?
Vacuum, electricity, or air pressure
What causes an electric driven gyro rotor to tilt when the aircraft is turned?
Gyroscopic precession
What is used as a guide for range marking of aircraft instruments?
Aircraft Specifications or Type Certificate Data Sheets and the specific aircraft maintenance manual or flight manual
Where are instrument range markings placed?
To the outer edge of the cover glass or over the calibrations on the dial face of the instrument
What other type of mark is required when range markings are applied to the glass instrument cover?
An index mark, which is a white line extending from the glass cover onto the case to indicate slippage of the glass
What is a synchro-type remote indicating system?
The system can be used to show movement and position of landing gear, wing flaps, oil cooler doors, or other movable parts of the aircraft. It is an electrical system used for transmitting information from one point to another. (Autosyn, Selsyn, and Magnesyn)
What type of fuel quantity system is an electric fuel measuring device that accurately determines the density weight of the fuel in the tanks of an aircraft?
The capacitor fuel type quantity system
What is meant by “swinging a compass”?
It is the adjustment of the North-South and East-West magnets to reduce deviation, which are magnetically influenced by the aircraft structure and electrical system
When inspecting a magnetic compass, the bowl should be filled with liquid and should not contain any bubbles or discoloration. What is the purpose of the liquid in the bowl?
Dampen the oscillations of the float
What is the fluid used in a magnetic compass?
A clear liquid such as kerosene
Where is the compass correction card placed?
Near the compass and in sight of the pilot
Which instrument is used to indicate the speed of the crankshaft of a reciprocating engine and the speed of the main rotor assembly in a turbine engine?
A tachometer
What type of indicating system is used to indicate turbine engine exhaust gas temperature (EGT)?
A thermocouple system
What does the manifold pressure gauge indicate when the engine is not operating?
It indicates atmospheric pressure
What is used to check a manifold pressure gauge for correct indication when the engine is not operating?
Either a barometer or an altimeter set to zero
What is the meaning of the yellow range on the airspeed indicator?
The yellow arc designates the cautionary range
What does a Mach meter indicate?
The ratio of aircraft speed to the speed at a particular altitude and temperature at any time during flight
Why do you not try to remove a blockage in a pitot system?
To prevent further damage to the system
What force affects all rotary type instruments?
Gyroscopic precession
