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Questions and Answers
Frequently, an aircraft's auxiliary power unit (APU) generator is:
Frequently, an aircraft's auxiliary power unit (APU) generator is:
Identical to engine driven generators
Fuel is normally supplied to an APU from:
Fuel is normally supplied to an APU from:
The airplane's main fuel supply
An APU is usually rotated during start by:
An APU is usually rotated during start by:
Electric starter
The function of an APU air inlet plenum is to:
The function of an APU air inlet plenum is to:
When in operation, the speed of an APU:
When in operation, the speed of an APU:
Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power, pneumatic loading will be automatically modulated to maintain a safe:
Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power, pneumatic loading will be automatically modulated to maintain a safe:
When necessary, APU engine cooling before shutdown may be accomplished by:
When necessary, APU engine cooling before shutdown may be accomplished by:
Usually, most of the load placed on an APU occurs when:
Usually, most of the load placed on an APU occurs when:
Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained:
Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained:
On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to:
On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to:
Flashcards
Engine driven generators
Engine driven generators
An aircraft's auxiliary power unit (APU) generator is very similar to these.
APU Fuel Source
APU Fuel Source
The airplanes' main fuel supply.
APU Air Inlet Plenum Function
APU Air Inlet Plenum Function
This ensures stable air pressure for the compressor.
APU Speed During Operation
APU Speed During Operation
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Maximum APU shaft output power
Maximum APU shaft output power
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APU Engine Cooling (Shutdown)
APU Engine Cooling (Shutdown)
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Most APU Load Occurs When
Most APU Load Occurs When
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Fuel scheduling during APU start
Fuel scheduling during APU start
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Primary Function of the Load Compressor
Primary Function of the Load Compressor
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Study Notes
- An aircraft's auxiliary power unit (APU) generator is identical to engine driven generators.
- Fuel is normally supplied to an APU from the airplanes main fuel supply.
- An APU is usually rotated during start by an electric starter.
- The function of an APU air inlet plenum is to stabilize the pressure of the air before it enters the compressor.
- When in operation, the speed of an APU remains at or near rated speed regardless of the load condition.
- When maximum APU shaft output power is being used in conjunction with pneumatic power, pneumatic loading will be automatically modulated to maintain a safe EGT.
- APU engine cooling before shutdown may be accomplished by closing the bleed air valves.
- Most of the load placed on an APU occurs when bleed air valves are opened.
- Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained automatically by the APU fuel control system.
- On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to provide bleed air for aircraft pneumatic systems.
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