Term
| What will cause an automatic shutdown of the APU in unattended mode? |
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Definition
APU fire/inlet overtemperature
overspeed/loss of overspeed protection
high EGT
low oil pressure
high oil temperature
generator oil filter approaching bypass
intake door failure
APU controller failure
speed droop (under speed)
no combustion on start
no acceleration on start
There is no cooldown period.
(FCOM Vol 2, Rev 2- 7.30.3) |
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Term
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Definition
Either engine running or starting, or In-flight
(FCOM Vol 2, Rev 2- 7.30.2) |
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Term
| What will cause an automatic shutdown of the APU in Attended Mode? |
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Definition
APU fire/inlet over temperature
overspeed/loss of overspeed protections
APU controller failure
speed droop (underspeed)
There is no cool down period. The EICAS advisory message, APU SHUTDOWN, displays
(FCOM Vol 2, Rev 2- 7.30.2) |
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Term
| What does the APU FAULT light mean? |
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Definition
Illuminated (Amber):
1. APU fault and/or fire is detected
2. APU shutdown due to fault and/or fire
3. momentarily during APU controller self test
(FCOM Vol 2, Rev 2- 7.10.20) |
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Term
What is the corresponding EICAS message for any of these following APU conditions?
High EGT
High oil temperature
Low oil pressure |
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Definition
APU LIMIT
(FCOM Vol 2, Rev 2- 7.30.2) |
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Term
| When does the APU start automatically, regardless of switch position? |
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Definition
In flight if both AC transfer busses lose power (this might be loss of both engines).
To turn it off once it's running, the switch must be selected to ON then OFF.
(FCOM Vol 2, Rev 2- 7.30.2) |
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Term
| What is the altitude limitation for the APU? |
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Definition
Starting- aircraft maximum certified altitude (43,100')
Electrical power is available throughout the aircraft operational envelope.
APU Bleed at or below 22,000'
(FCOM Vol 2, Rev 2- 7.30.1) |
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Term
| What protections do the EECs provide in the ALTERNATE MODE? |
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Definition
N1 and N2 Overspeed only.
(FCOM Vol 2, Rev 2- 7.20.5-6) |
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Term
| What happens if the EECs detect an internal fault? |
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Definition
They automatically go into the Soft Alternate Mode, which keeps the same thrust at a fixed position of the thrust levers.
(FCOM Vol 2, Rev 2- 7.20.5) |
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Term
| Why do we select the Hard Alternate Mode if the EEC has gone into the Soft Alternate Mode? |
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Definition
To prevent thrust lever stagger at even thrust settings
To prevent asymmetrical thrust when levers are not staggered. To regain the command and reference prompts on the N1 indications
(but these are displayed in soft mode as well...?)
(FCOM Vol 2, Rev 1- 7.20.5) |
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Term
| Is the autothrottle available in the Hard Alternate Mode? |
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Definition
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Term
| What should you know about thrust lever position and actual thrust between the Normal and Alternate Mode? |
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Definition
The same thrust lever position in the Alternate Mode yields either equal or greater thrust than the Normal Mode.
(FCOM Vol 2, Rev 2- 7.20.5) |
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Term
| What must we do before selecting the Hard Alternate Mode? Why? |
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Definition
Retard the thrust levers to the mid position; to prevent over boost.
(QRH Rev 17- 7.14) |
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Term
| How many start attempts will the Auto-Start System make on the ground/in flight? |
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Definition
3 on the ground
Unlimited In-Flight
(FCOM Vol 2, Rev 2- 7.20.7-10) |
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Term
| When will Auto-Start not attempt another start on the ground? |
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Definition
Hot start
Hung start
No EGT rise 4 sec
Damage-starter
Shaft failure
Compressor stall
No N1 rotation
Oil pressure 10 psi or less (705/706 only)
Air-starter duty cycle exceeded.
Insufficient air pressure (too little)
(FCOM Vol 2, Rev 2- 7.20.8, 10) |
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Term
| What does Auto-Start not monitor? |
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Definition
N705GT, N706GT = Oil Temperature
All others = Oil Temperature and Oil Pressure
(FCOM Vol 2, Rev 2- 7.20.8-9) |
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Term
| What action should you take for hot oil temperature during start? |
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Definition
Fuel Control Switch to CUTOFF
Call maintenance
Do not motor engine.
(memory item auto start fail)
(updated ref needed) |
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