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What is the APU used for?
Electrical and Bleed air
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What monitors and controls the APU?
It own dedicated FADEC
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How are the batteries used for APU start?
- Batt 2 powers the APU START bus
- Batt 1 powers the FADEC and EICAS for monitoring
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What is the fuel source for the APU?
- Right fuel tank
- LEFT fuel tank though the crossfeed
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What fuel pump is used for APU start?
- Batteries only ... DC FUEL PUMP
- AC powered AC ... AC fuel pump 2
- Right engine running... Ejector fuel pump
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When does the APU and pneumatic loading become available?
3 sec after APU has reached 95%
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Will the APU shutdown automatically if the APU fails to start within the normal start time?
Yes
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What does moving the APU selector knob to off do?
- Initiates normal APU shutdown
- 1 min cool down
- Pneumatics removed immediately and electrical removed after the cool down period
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Can the APU pneumatics be used during the cool down period?
No
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Can the APU electrical power be used during the cool down period?
Yes
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If you need the APU 50 seconds into shutdown is there a way to get it back?
Yes, turn the master switch to on
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Can the APU shutdown be cancelled?
Yes, by rotating the master switch back to ON
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How can the APU be shutdown immediately?
- APU EMERGENCY STOP button
- There will be no 1 min cool down period
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When will automatic shutdown of the APU occur?
On ground.... ALL Conditions
In AIR .... over speed, underspeed, FADEC critical fault
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When do we get the red bar on the APU EMER stop button?
When an APU fire is detected
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What happens when the APU EMER stop button is pressed?
- The APU fuel shut off valve closes and the APU will shutdown with no cool down period.
- A white stripe illuminates on the button
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Does the cool down period apply to the EMER stop button to the APU?
No
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What is the maximum altitude for operation of the APU bleed?
15,000 ft
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What is the maximum altitude for APU operation?
33,000 ft
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What is the maximum altitude for APU start?
30,000 ft
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Up to what altitude may the APU assistant in engine start?
21,000 ft
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In normal operations on the ground with the APU running it would be normal to see the fuel unbalanced with less fuel in which tank?
Right tank
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