ENGINEERING Flashcards
ou are level at your cruise altitude of FL310 at a speed of Mach .83. ATC tells you to maintain a speed of no greater than Mach .80. You pull the thrust levers back and the engines decelerate. The engine are decelerated because:
The turbine power exceeds the compressor power required to maintain Mach .83.
The turbine power is less than the compressor power required to maintain Mach .83.
The power extracted by the turbine will equal the power required to operate the compressor.
The amount of ram air available to the compressor section diminishes.
The turbine power is less than the compressor power required to maintain Mach .83.
High fuel flow during engine start can be an indication of what?
A tailwind.
Introducing fuel into the engine before the compressor is up to proper speed.
Engine fuel pump malfunction.
Fuel control malfunction.
Fuel control malfunction.
During an engine start you notice that the N2 is lower than normal and the EGT is higher than usually seen, but not excessive or approaching the start limits. What problem, if any, is the engine experiencing?
A hot start.
Start is normal.
A possible hung start.
Weak igniters in the combustor section.
A possible hung start.
WHEN SPOILERS ARE FULLY EXTENDED AS A SPEED BRAKE, BOTH SIDES REMAIN IN THE EXTENDED SPEED BRAKE POSITION, AND THEREFORE, THE SPOILERS DO NOT PROVIDE ANY ROLL CONTROL. WHAT TYPE OF SPOILER SYSTEM DOES THIS BEST DESCRIBE?
SEQUENTIAL
NON-SEQUENTIAL
DIFFERENTIAL
NON-DIFFERENTIAL
NON-DIFFERENTIAL
When wing fuel tanks on certain heavy aircraft, such as the MD-11, get below a certain fuel quantity, VMO/MMO is reduced. The primary reason for this is because:
The weight of the fuel in the wing fuel tanks that has been burned off is no longer available to provide added structural stability required at higher true airspeeds.
The weight of the fuel in the wing fuel tanks that has been burned off is no longer available to provide added structural stability required at higher indicated airspeeds.
Without the added weight of the fuel on the wing, the angle of attack increases, making the aircraft more susceptible to Mach tuck at higher airspeeds.
Without the added weight of the fuel on the wing, the angle of attack increases, making the aircraft more susceptible to wing twist at higher airspeeds
The weight of the fuel in the wing fuel tanks that has been burned off is no longer available to provide added structural stability required at higher indicated airspeeds.
Activation of the trailing edge flaps automatically deploys:
The slats, which are driven out of the leading edge and downward, extending the camber of the wing.
The slats, which are driven out of the leading edge and downward, extending the chord of the wing.
The leading edge flaps, which are driven out of the leading edge and downward, extending the camber of the wing.
The leading edge flaps, which are driven out of the leading edge and downward, extending the chord of the wing.
The leading edge flaps, which are driven out of the leading edge and downward, extending the camber of the wing.
Which hydraulic operation normally uses a double-acting, unbalanced linear actuator?
Brakes.
Landing gear.
Autopilot servo.
Rudder actuators.
Landing gear.
DURING ENGINE START YOU NOTICE THAT THE N2 IS NOT SPOOLING UP AS FAST AS YOU NORMALLY MIGHT SEE IT. YOU ARE AT AN AIRPORT THAT IS 5600 FT MSL ON A VERY HOT DAY WITH A SLIGHT WIND FROM BEHIND. GIVEN THE SITUATION, WHAT POSSIBLE START ANOMALY WOULD YOU WANT TO BE ON THE LOOKOUT FOR
HOT START
HUNG START
NO START ANOMALY EXISTS IN THIS SCENARIO
NO START
HUNG START
The speed brake control can deploy all spoiler and speed brake surfaces fully when operated.
Often, these surfaces deploy on the ground automatically when engine thrust reversers are retracted.
Often, these surfaces deploy on the ground automatically when engine thrust reversers are activated.
Often, these surfaces deploy on the ground automatically when brakes are activated.
Often, these surfaces deploy on the ground automatically when brakes are retracted.
Often, these surfaces deploy on the ground automatically when engine thrust reversers are activated.
Mixing aviation gasoline with jet fuel will affect a turbine power plant by forming on the:
Fan blades.
Inlet guide vanes.
Compressor blades.
Turbine blades.
Turbine blades.
Your ammeter pointer display a positive indication. What information does this provide to the pilot?
The charging rate of the battery.
The battery is fully charged.
More current is being drawn from the battery than is being replaced.
The amount of charging current demanded by the battery.
The charging rate of the battery.
How are airplane AC generators rated?
Kilovolt-amps (KVA)
Kilowatts (KW)
Amps
Volts
Kilovolt-amps (KVA)
The stators in the turbine section of a gas turbine engine:
Decreases temperature.
None of the above.
Increase the velocity of the gas flow.
Increases pressure.
Increase the velocity of the gas flow.
The purpose of hydraulic accumulator is to:
Supply hydraulic fluid for normal operations under low demand.
Compensate for potential loss of pressure at high altitudes.
Maintain Fluid pressure and supply fluid under high demand.
Filter debris and remove air.
Supply hydraulic fluid for normal operations under low demand.
Why are fixed orifice nozzles used in the lubrication system of turbine engines?
To keep pressure on the oil pump, thus preventing oil foaming.
To protect oil seals by preventing excessive pressure from entering the bearing cavities.
To keep pressure on the oil pump, thus preventing air lock.
To provide a relatively constant oil flow to the main bearings at all engine speeds.
To provide a relatively constant oil flow to the main bearings at all engine speeds.
In a gas turbine engine the inlet, compressor, and diffuser sections are responsible for?
Building static energy of the airflow.
Transferring static energy into thrust.
Building potential energy of the airflow.
Transferring compressed airflow into kinetic energy.
Building potential energy of the airflow.
How does “ram effect” affect performance of a turbine engine?
Increases temperature at the engine inlet, thus increasing performance.
Increases pressure at the engine inlet, thus decreasing performance.
Increases pressure at the engine inlet, thus increasing performance.
Decreasing air density at the engine inlet, thus decreasing performance.
Increases pressure at the engine inlet, thus increasing performance.
Which of these items would not normally be fitted to the engine accessory system?
EGT/TIT
Engine driven fuel pump
N1
N2
EGT/TIT
You are in level flight and encounter icing conditions, and you know that the pitot system heat is not working. What do you do?
Descend to a lower altitude and find a colder SAT
Descend to a lower altitude and find a warmer SAT.
Climb to a higher altitude; warmer than the current freezing level
Make no changes until you can ensure accurate airspeed inputs.
Climb to a higher altitude; warmer than the current freezing level
Correct
If you can find colder temperatures, the liquid water in the atmosphere will become frozen, making it less likely that freezing precipitation will clog the pitot tubes. Reference: Airplane Flying Handbook, Transition to Multiengine Airplanes.
How do you tell the loads on the electrical bus?
Check the load meter.
Check the circuit breakers.
Look at the generator output.
Check the battery discharge rate.
Check the load meter.
Correct
Load meters will tell you to amperage load on a bus, usually in a fraction of the maximum load. Reference: Aviation Maintenance Technician Handbook – Airframe (Vol 2), Aircraft Electrical System.
What instrument is primary for pitch in straight and level flight?
Attitude indicator. Airspeed indicator. VSI. Altimeter. Correct The altimeter is the primary instrument for level flight. Reference: Instrument Flying Handbook, Airplane Attitude Instrument Flying Using Analog Instrumentation.
Altimeter.
What types of electricity do most large aircraft generate from engine driven generation systems?
AC.
DC.
Variable frequency AC.
Variable frequency DC.
AC.
Correct
Large aircraft typically generate AC power from generators. These are called constant speed drives or integrated drive generators. Through gearing, they spin at a constant speed to produce 400hz power. Reference: Aviation Maintenance Technician Handbook – Airframe (Vol 2), Aircraft Electrical System.
Why is fluid used in hydraulic systems over gas?
It is cheaper than generating extra engine power.
Gas in incompressible, which would overstress components.
Because fluid is not compressible like gas.
Gas is undependable at low temperatures.
Because fluid is not compressible like gas.
Correct
Since fluid is not compressible, the pressure of the fluid can be transferred directly to the actuator for the flight control surface. A gas is compressible, making the use of gas undependable for high-pressure surface movement applications. Reference: Pilot’s Handbook of Aeronautical Knowledge, Aircraft Systems.
What is trim?
Provides feedback on the yoke to prevent over control.
Moves in the opposite direction of the primary control to relieve control pressure.
Provides a tab by which the flight control is easier to move.
Allows bleed air to enter the engine anti-ice actuator.
Moves in the opposite direction of the primary control to relieve control pressure.
Correct
Trim tabs move in the opposite direction of the control surface, in essence flying the trailing edge into the correct position for a given airspeed. They are used primarily to relieve control forces. Reference: Pilot’s Handbook of Aeronautical Knowledge, Flight Controls.
