Systems Limitations Flashcards
APU, Autoland, Pressurization
Max Negative Cabin Pressure
-1.0 PSI
Max Positive Cabin Pressure
9.0 PSI
Safety Relief Valve - Cabin
8.6 PSI
Ram Air Inlet Pressure to Open
Only opens if differential pressure is lower than 1 PSI
APU Bleed Use with Low Pressure (LP) Ground Unit
Do not use conditioned air simultaneously from PACKS and LP ground unit (to avoid chattering of the non return valves).
APU Bleed Use with High Pressure (HP) Ground Unit
Use of an external HP Cart to supply PACKs for Air Conditioning is PROHIBITED.
Air Conditioner Avionics Parameter
The aircraft electrical system should not be powered for more than 2 hours without a cooling system when the OAT is above 49C
Can you operate the APU if the LOW OIL LEVEL ECAM advisory is displayed?
Yes; MX action is required within next 10 hours of APU operation.
APU Starter Duty Cycle
1 Minute between each start attempt. Then 60 minutes after 3 consecutive starts.
Max EGT for APU
675C
Max EGT for start (Inflight) APU
At or above FL350: 1120C
Below FL350 : 1090C
Max Rotor Speed APU
107% (APU auto shuts down at 107% N speed ECAM Display)
Max Altitude for APU start using battery power only (Elec EMER Config)
FL250
Max Alt for APU start using normal electrics
FL390
Max Alt for APU - One pack operation with electrical
FL225
