Airframes, Engines, Propellers, and Aircraft Systems Flashcards
What is Flex Temp?
It is the assumed temperature used to reduce the thrust of a gas turbine engine.
- Used to reduce takeoff thrust to the minimum needed for a safe takeoff
- Allows for less noise and less engine wear
- Flex temp is the highest ambient temperature allowed at which the aircraft could make a safe takeoff at minimum thrust
Higher flex temp = less performance needed due to good conditions, long runway, light aircraft, etc. (saves the engine!)
Which system(s) are used to operate the de-icing boots?
Pneumatic system.
Np represents ___ speed rotation and Ng represents __ speed rotation in a free-turbine type engine.
Propeller RPM and gas generator speed.
Weight shift formula:
Weight to be shifted / Total weight ÷ Δ CG / distance weight is shifted
Which of the following is taken into account by an aircraft’s manufacturer to determine Vmca?
?
In determining whether a turbojet aeroplane used in a commuter operation can be dispatched or a takeoff can be conducted, not more than __% of the reported headwind component or not less than__% of the reported tailwind component shall be taken into account.
50, 150
What is the final assurance of a safe takeoff in case of icing conditions?
Compared to the axial compressor, the centrifugal compressor:
Has a larger frontal area.
In an engine equipped with a turbocharger, the turbocharger compresses the air ___ it is mixed with the fuel. When the outside air is not dense enough, the wastegate valve __, thereby directing exhaust gas to the turbine, which will start to rotate and thus compress the air.
Before, closes.
What is the mechanism that prevents the reversing of a turboprop engine aeroplane during a cruise flight?
The low (or fine) pitch stop system.
System blocks the use of reverse thrust when props are over a certain value, or in flight.
What devices offer electrical protections to an aircraft’s electrical circuits?
- Fuse
- Generator control unit
- Circuit breakers
What causes compressor stalls?
A too high angle of attack to the compressor blades.
What is the basic principle of a turbocharger?
Increases the DENSITY of air that is supplied to the motor therefore increasing power to engine.
In a turbocharged engine, a waste-gate located in the ___ exhausts gas directly in the atmosphere, bypassing the ___.
Exhaust system, turbine wheel.
A flight control system is a system that:
Includes the flight direction and autopilot system.
The torque motor of the gyromagnetic remote indicating compass:
Makes the directional gyroscope to precess. (A SLAVE HSI)
Viscous hydroplanning occurs when:
Aircraft is slow over a thin film of water.
Ground effect is strongest on an aircraft with ___ wings and a ___ wingspan.
LOWER wing and HIGHER wingspan; Arrow has better ground affect than cessna!
To avoid tailplane stalling, you should avoid:
Exceeding tailplane critical angle of attack by abruptly pushing on control column.
Shock waves form near ____ and cause a ____ motion of the plane.
Root, nose down.
When decreasing at a constant CAS, the mach number ______ and the local speed of sound ____.
Decreases (like flight sim) and increases (more air = more crap for sound to move through)
Formula for required bank in rate one turn:
TAS / 10 + 7 kts
TAS/10 + 5 mph
