Flashcards in APU Deck (13)
Can the APU be started and operated even if the LOW OIL LEVEL ECAM advisory is displayed?
Yes. If there is no oil leak, then the remaining oil quantity allows normal APU operation for about 10 hours. (Ref: ECAM Advisory conditions)
Maintenance action is required within 10 hours of APU operation.
What is the maximum APU Rotor speed?
Maximum N (ECAM display) 107%
The APU automatically shuts down at 107 % N speed, that appears on the ECAM. This corresponds to an actual N speed of 106 %.
Maximum EGT (A320s)?
APU Starter limit?
After 3 starter motor duty cycles, wait 60 min before attempting 3 more cycles.
APU operation and restart limit (A320/A319)?
FL410 or 41,000 feet
Electrical only from FL225 to FL410
*Reduced Generator loads in flight at the upper FLs. See APU limitations - Envelope and Table.
APU battery restart limit (Emergency Electrical Configuration)?
FL250 or 25,000 feet
APU bleed limit [Bleed+Elec] (A320)?
FL225 or 22,500 feet (Up to one pack only)
FL150 or 15,000 feet (For two packs)
FL200 or 20,000 feet (For engine starting)
What is the APU Bleed altitude limit for engine starting in-flight?
FL200 or 20,000 feet
What is the in-flight APU Bleed limit using one pack only?
FL225 or 22,500 feet
What is the in-flight APU Bleed limit using both packs?
FL150 or 15,000 feet
Air bleed extraction for wing anti-icing is not permitted. True or False?
The APU bleed can be used for Wing Anti-Ice. True or False?
Air bleed extraction for wing anti-icing is not permitted.