BOEING 747-400 - APU UPDATED

Q 1. Under what conditions can the APU be started in flight?

A. Within the inflight start envelope on the EICAS?
B. When required during engine out conditions.
C. The APU may not be started in flight.
D. By positioning the APU start source selector to APU inflight.

Q 2. What is the normal sequence of events when the APU Selector is positioned OFF?

A. The APU bleed air valve closes, the APU generators shed their electrical load, and a one minute shutdown cooling cycle commences
B. The APU air inlet door closes when N2 decelerates through 20%
C. The first two statements are correct.

Q 3. What are the minimum electrical power source(s) necessary for start and operation of the APU?

A. The APU battery is the only minimum electrical source required for starting the APU.
B. The APU battery and the main battery are both required minimum electrical sources for starting the APU.
C. The APU battery and either ground handling bus are both required minimum electrical source required for starting the APU.
D. The main battery the only minimum electrical source required for starting the APU.

Q 4. Which of the following regarding the APU shutdown cycle is correct?

A. When the APU Selector is positioned OFF, the APU bleed air valve is commanded open and the APU shuts down.
B. The APU Bleed Air Switch must be positioned OFF for 60 seconds prior to positioning the APU selector OFF.
C. When the APU Selector is positioned OFF, the APU bleed air valve is automatically commanded closed, and the 60 second shutdown cooling cycle commences.
D. The shutdown cycle does not require a cooling down period.

Q 5. The APU Selector is moved from OFF to START and released to ON. Which of the following is true regarding the automatic start sequence?

A. The APU starter is engaged any time the APU selector is positioned ON
B. The APU starter is automatically engaged when the fuel valve is sensed open
C. The APU starter will engage only if the air inlet door is sensed open.

Q 6. Which of the following is true regarding EICAS advisory message APU?

A. Turning the APU Selector to OFF resets the APU fault logic and the APU message will no longer be displayed. The APU may be restarted if the EICAS message APU is not redisplayed when the APU Selector is turned to ON.
B. The EICAS message APU indicates that the APU is unusable; no further attempt should be made to use the APU until maintenance clears the fault
C. If the APU continues to operate after the APU Selector is OFF, the APU may be shut down manually by pulling the APU Fire Switch

Q 7. If the APU is running and the Battery Switch is selected OFF, which of the following occurs?

A. The APU shuts down immediately, eliminating the 60 second cooldown cycle.
B. The APU continues to run normally.
C. The APU completes the 60 second cooldown cycle then shuts down.
D. The APU continues to run, but both APU generators shed their electrical load.

Q 8. When using the APU as the bleed air source, how many air conditioning packs may be operated during engine start?

A. Three packs
B. Two packs
C. All packs may be off or one pack may be on for engine start.

Q 9. When does the EICAS advisory message APU display?

A. It displays when the APU Selector is OFF, and an APU fault shutdown has occurred.
B. It displays when the APU cannot be restarted until maintenance action is performed.
C. It displays when the QRH procedure requires that the APU should be shut down using the APU Fire Switch if the APU Selector is ON.
D. It displays when the APU Selector is ON, and an APU fault shutdown has occurred or when a QRH procedure may require using the APU Fire Switch to shut down the APU.

Q 10. Which statement is true regarding the APU?

A. Only one APU generator may be used during main engine start
B. The APU should not be used as source of bleed air and electrical power simultaneously
C. The APU provides sufficient output to supply electrical power for all normal loads plus sufficient bleed air to operate one air conditioning pack during engine start.

Q 11. The APU is available as a source of electrical power both inflight and on the ground.

A. True.
B. False.

Q 12. What is the maximum pressure altitude at which the APU may be used as a source of bleed air?

A. 45,100 feet
B. 20,000 feet
C. 15,000 feet
D. APU bleed air may be used only on the ground.

Q 13. What is the maximum pressure altitude at which the APU may be operated in flight?

A. 45,100 feet
B. 20,000 feet
C. 15,000 feet
D. The APU may not be operated inflight.

Q 14. What is the APU fuel source?

A. Main tank #1
B. Main tank #2
C. The APU fuel tank.

Q 15. The APU starter will engage only after the APU air inlet door is open.

A. True.
B. Open.

Q 16. When are the APU generator AVAIL lights illuminated?

A. N1 RPM is 95% or more
B. Both frequency and voltage are acceptable.
C. The momentary action switches are pushed on.

Q 17. The VALVE light on the bottom half of the APU Bleed Isolation Valve switch is illuminated. What does this indicate?

A. The valve is open
B. The valve is closed
C. The valve position disagrees with the commanded position.

Q 18. What EICAS memo message is displayed when APU N1 rpm is greater than 95% and the APU Selector is ON?

A. APU RUNNING
B. APU
C. APU COOLDOWN
D. There is no Memo message.

Q 19. When is the EICAS advisory message APU FUEL displayed?

A. Fuel pressure is low or fuel valve is closed
B. Fuel pressure is low. The APU fuel pump is commanded ON and the fuel valve position disagrees with the commanded position
C. Fuel quantity in main tank 2 is below 2,000 lbs.(900 Kgs)
D. Fuel pressure is low or and fuel quantity in main tank 2 is low.

Q 20. What causes the EICAS message APU to be displayed?

A. The APU N1 RPM remains above 95% with the APU selector in the OFF position
B. The APU has shutdown due to a fault, and the APU selector is in the ON position
C. The first two statements are correct.

Q 21. What does the EICAS advisory message APU DOOR indicate?

A. The APU exhaust door position disagrees with the commanded position.
B. The APU door is not in commanded position.
C. The APU has shut down due to a system fault .
D. The APU inlet door is open.

Q 21. (Freighter) Which of the following statements about the APU Start Source Switch on the overhead maintenance panel is correct?

A. Is normally placed in the TR position when using ground service power.
B. In the TR position, the TR is automatically selected as the first source for APU starter power whenever AC power is available.
C. In the TR position, the APU battery is automatically selected as the first source for APU starter power.
D. The switch position has no effect on selection of APU starting power whenever AC power is available.

Q 22. Which statement regarding the APU is correct?

A. APU bleed air is available in flight for one pack up to 20,000 feet.
B. The APU should not be used as source of bleed air and electrical power simultaneously.
C. The APU provides sufficient output to supply electrical power for all normal ground operations.
D. The APU can supply sufficient bleed air for all three air conditioning packs during engine start.

Q 23. (Freighter) During taxi-in the normal position of the APU Start Source switch is TR. This means that when starting the APU:

A. The APU DC electric starter is powered by an APU start transformer rectifier (TR).
B. APU battery power is selected for starting the APU. The transformer rectifier (TR) is removed from the APU starting circuit.
C. In case of a transformer rectifier (TR) overheat during APU start the start sequence will continue to use the APU pneumatic starter.

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