Systems APU Flashcards
When starting APU how long should switch be held in starting position
3 Seconds
FCOM 1 04-02-11
The APU is limited to ___ start attempts within __ hour and __ mins between starts. The ECU prevents restart until RPM decreases to less than ___ %
3 starts 1 hour 2 mins 7%
FCOM 04-02-13
What happens when an Overspeed condition is detected by the APU ECU on the ground and inflight
AUTO Shutdown
FCOM 1 04-02-14
How long is the automatic cooldown period for the APU when it is selected to OFF
60 secs
FCOM 1 04-02-14
What is the altitude limit for APU Bleed Air extraction
23,000 ft
AFM 02-07-1
APU fuel burn on ground GEN only
90 kg/hr
OM-A 13.4
APU fuel burn on ground GEN and 1 or 2 Packs
130 kg/hr
OM-A 13.4
APU fuel burn in flight
Additional 136 kg/hr or 5.5% of trip fuel whichever is higher
OM-A 13.4
The accessory gearbox attached to APU drives a ___ phase, ___ Hz, ___ VAC variable frequency generator that can generate ___ kVA
3 Phase, 400 Hz, 115 VAC 75 kVA
FCOM 04-01-1
Min Oil temp for APU start
-40 deg
AFM 02-07-1
APU certified for unattended operation on the ground provided that
Either Wing fuel tank quantity is not greater than 2830kg
AFM 02-10-3
FCOM 2 02-10-3
The APU ECU is located in the
Mid Equipment Bay
FCOM 1 04-02-4
Fuel is supplied to the APU by
Left Main Ejector fuel pump if operating
Either of the fuel tank AC boost pumps
Suction feed if no AC power and left engine not operating
FCOM 1 04-02-8
Starting the APU requires external AC power which supplies the ___ or both batteries
TRU 3
FCOM 1 04-02-11
The APU ECU prevents APU start from TRU 3 if
Any TRU is inoperative
FCOM 1 04-02-11
If the batteries are used for starting the APU, Batt 1 powers the ___ while Batt 2 powers the ___
Batt 1 ECU Batt 2 APU starter
FCOM 1 04-02-11
When APU rpm reaches ___ % it is ready for electrical and pneumatic loading
95%
FCOM 1 04-02-13
The APU can be shutdown from the Flightdeck and the
External service panel and APU compartment
FCOM 1 04-03-2
