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APU B737NG

By Carlos Alfaro / December 16, 2024

APU B737NG

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APU B737NG 0%

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Question 1 of 24
1. Question
On the 737NG, the APU will automatically shut-down
- When the battery switch is placed OFF on the ground only.
- When the battery switch is placed OFF at any time.
- When the battery switch is placed OFF in flight only.
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Question 2 of 24
2. Question
With a 737NG APU aborted start on the ground, another start may be attempted immediately but…
- After three consecutive aborted start attempts, a fifteen minute cooling period is required
- But 3 minutes cooling is required between the second and third attempt and a wait of 30 minutes is required after the third start attempt.
- But 3 minutes cooling is required between subsequent attempts.
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Question 3 of 24
3. Question
The overspeed light will illuminate when an APU RPM limit exceedance causes automatic shutdown
- the light does not extinguishe after the APU switch is placed to OFF
- the light extinguishes after 5 minutes from when the APU switch is placed to OFF
- the light extinguishes when the APU switch is placed to OFF
Correct
Incorrect
Question 4 of 24
4. Question
If the APU generator is providing electrical power to the aircraft while on the ground,
- The galley electrical loads will automatically be shed if the total electrical power requirements exceed design limits.
- The galley electrical loads will automatically be shed if the total electrical power requirements exceed design limits on the B737-400 only.
- The galley electrical loads will not be automatically shed.
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Question 5 of 24
5. Question
Should the APU switch fail to shut-off the APU
- Pull up the APU Fire Warning Switch.
- The APU Overspeed Reset switch in the E & E compartment has been tripped and must be reset.
- Trip the APU fuel valve CB.
Correct
Incorrect
Question 6 of 24
6. Question
Illumination of the APU DET INOP light
- Does not activate the master caution system.
- Activates master caution "OVHT/DET".
- Activates master caution "APU".
Correct
Incorrect
Question 7 of 24
7. Question
If the APU runs down due to fuel starvation, the Master Caution annunciation system will show
- APU and services being operated by the APU.
- Services being operated by the APU only.
- APU only.
Correct
Incorrect
Question 8 of 24
8. Question
APU bleed air
- Is not allowed to be used for wing anti-ice.
- Is allowed to be used for wing anti-ice on the ground only.
- Is allowed to be used for wing anti-ice.
Correct
Incorrect
Question 9 of 24
9. Question
The APU fire warning system gives aural and visual warnings
- Only in the flight deck.
- In the flight deck and the APU compartment.
- In the flight deck and main wheel well.
Correct
Incorrect
Question 10 of 24
10. Question
737NG: When electrical load and air extraction raise the EGT above acceptable levels during engine starting,
- electrical load shedding occurs prior to reducing bleed air.
- Is armed at all times.
- the ECU will automatically shutdown the APU.
Correct
Incorrect
Question 11 of 24
11. Question
During a normal APU start
- The starter motor is engaged as soon as the master switch is released from START to ON.
- The blue APU GEN OFF BUS bus light goes out at 95% RPM.
- The amber LOW OIL PRESSURE light is lluminated until the APU oil pressure is normal (approx. 35% RPM).
Correct
Incorrect
Question 12 of 24
12. Question
The APU fuel heater
- Is automatically operated and uses 5th stage bleed air from Engine No. 2.
- Uses heat supplied directly from the APU oil cooler.
- Is automatically operated and uses the APU compressor bleed air.
Correct
Incorrect
Question 13 of 24
13. Question
If an APU fire warning is sensed
- The APU will shut-down and the extinguisher is discharged automatically.
- The APU must be shut-down by pulling up the fire switch.
- The APU will shut-down automatically.
Correct
Incorrect
Question 14 of 24
14. Question
The Allied Signal 131-9(B) APU generator is rated at:
- 45 KVA in-flight and 55KVA on the ground.
- 90 KVA up to 32,000ft and 66 KVA up to 41,000ft.
- The same rating as an engine driven generator.
Correct
Incorrect
Question 15 of 24
15. Question
How is the APU is switched onto the AC electrical system?
- Automatically when the previous power source is disconnected.
- Automatically if the APU generator is running.
- By two APU switches individually operated.
Correct
Incorrect
Question 16 of 24
16. Question
During a 737NG APU start
- EGT indication may fluctuate from 0Âº to 1100Âº C prior to normal EGT rise and should be monitored for exceedances
- It is not necessary to monitor EGT
- Automatic shutdown will not occur in the event of EGT exceedance
Correct
Incorrect
Question 17 of 24
17. Question
The 737NG APU start cycle
- may take as long as 180 seconds.
- may take as long as 60 seconds.
- may take as long as 120 seconds.
Correct
Incorrect
Question 18 of 24
18. Question
The maximum aircraft altitude for both APU bleed and electrical load is?
- 35,000ft
- 17,000ft
- 10,000ft
Correct
Incorrect
Question 19 of 24
19. Question
The APU may be operated with APU bleed only up to a maximum altitude of
- 35,000ft
- 10,000ft
- 17,000ft
Correct
Incorrect
Question 20 of 24
20. Question
The maximum aircraft altitude for APU electrical load is?
- 37,000ft Garrett; 35,000ft Sundstrand; 41,000 Allied Signal.
- 35,000ft Garrett; 37,000ft Sundstrand; 41,000 Allied Signal.
- 37,000ft Garrett; 37,000ft Sundstrand; 41,000 Allied Signal.
Correct
Incorrect
Question 21 of 24
21. Question
The APU bleed valve
- may be open during engine start, but avoid engine power above idle.
- 725 degrees C
- 710 degrees C
Correct
Incorrect
Question 22 of 24
22. Question
When does the APU fuel solenoid valve open?
- When oil pressure has reached 4psi.
- When oil pressure has reached 13psi.
- When oil temperature has reached a minimum value.
Correct
Incorrect
Question 23 of 24
23. Question
The APU LOW OIL PRESSURE light is
- Always illuminated when the APU switch is in the OFF position.
- Inhibited during APU start.
- Disarmed when the APU switch is in the OFF position.
Correct
Incorrect
Question 24 of 24
24. Question
The APU Electrical Generator and APU Oil Cooler are cooled by
- A gear driven fan.
- Ram air pressure.
- An Oil/Fuel heat exchanger.
Correct
Incorrect

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