-
What are the methods used to start the APU?
- The APU electrical power switch on the electrical power panel.
- The start/stop switch on the APU control panel.
- (REFERENCE: FCOM Volume 3 APU)
-
What power source does the APU use for start?
- Aircraft battery.
- (REFERENCE: FCOM Volume 3 APU)
-
What are the indications if the APU is started from the electrical panel?
- Flashing AVAIL light on the electrical panel until N2 reaches 95%
- Flashing ON light on the APU control panel.
- (REFERENCE: FCOM Volume 3 APU)
-
When will the APU electrical power be connected to the AC buses if the APU is
started from the electrical panel?
- Power is automatically applied to any AC bus that isn’t powered by its respective
- generator.
- (REFERENCE: FCOM Volume 3 APU)
-
Where is the APU external fire control panel located?
- Located in the fairing immediately behind the left wheel well.
- (REFERENCE: FCOM Volume 3 APU)
-
When AC power is not available, how is fuel provided to the APU for starting?
- Fuel for starting is provided by a Battery Bus powered DC start pump in the # 2 main
- tank.
- (REFERENCE: FCOM Volume 3 APU)
-
Prior to engine start after ignition is armed, what synoptic page can be selected to
verify the APU is operating properly and what should the N1 now indicate?
- Selecting the secondary engine page displays the APU N1, EGT, N2, and oil
- quantity. N1 should be 100% after ignition is armed.
- (REFERENCE: FCOM Volume 3 APU)
-
Can pressing the APU electric switch stop the APU if the APU was started with the
START/STOP switch on the APU control panel?
- No.
- (REFERENCE: FCOM Volume 3 APU)
-
Which engine air system shares ducting with the APU?
- The # 2 air system shares ducting with the APU and is used to supply air to the other
- systems through the isolation valves.
- (REFERENCE: FCOM Volume 3 APU)
-
What does an illuminated “USE ENG AIR” switch on the overhead panel indicate?
- The APU air is selected ON and the cabin differential pressure is greater than 1.5
- PSI.
- (REFERENCE: FCOM Volume 3 APU)
-
What does the APU generator switch “OFF” light indicate?
- The APU generator is on speed and there is a malfunction. Switch can be pressed
- to reset APU generator control unit (one time) if electrical system is in MANUAL.
- (REFERENCE: FCOM Volume 3 APU)
-
During APU start with AC power not available the “FUEL” light illuminates on the APU control panel. What does this light indicate?
- Fuel pressure is low.
- The DC start pump is not supplying adequate pressure, or the APU fuel shutoff valve has failed to open.
- (REFERENCE: FCOM Volume 3 APU)
-
What are the limitations regarding APU operation in flight?
- (a) Start altitude 25,000 feet or less
- (b) Run altitude up to 30,000 feet
- (c) Used for electrical use only in flight.
- (REFERENCE: FCOM Volume 3 APU)
-
What happens when the APU fire handle is pulled?
- APU goes to emergency shutdown, the APU generator field is de-energized, the fire
- bottles are armed, and the APU fuel valve is closed. If the Air System is in auto
- mode, the # 2 engine bleed valve closes and the APU bleed valve will close.
- (REFERENCE: FCOM Volume 3 APU)
-
What happens to the APU bleed valve when the APU is shut down?
- The APU bleed air valve closes when the APU is shutdown even if the APU BLEED
- AIR switch is left ON.
- (REFERENCE: FCOM Volume 3 APU)
-
What does the fail light indicate?
- A start is not possible and maintenance is required.
- (REFERENCE: FCOM Volume 3 APU)
|
|
