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 prevent adverse effect on the A?C Conditioning system.
APU Bleed Use with High Pressure (HP) Ground Unit
Use of an external HP Cart to supply PACKs for Air Conditioning is PROHIBITED.
Avionics Ventilation
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.
(No Logbook entry required).
APU Starter Duty Cycle
After 3 consecutive start attempts, 60 min wait.
Max EGT for APU (Running)
675C
Max EGT for start (Inflight) APU
At or above FL350: 1120C
Below FL350 : 1090C
Max Rotor Speed APU
107%
What is the max altitude to start the APU using battery power only?
FL250
Max Alt for APU start using normal electrics & APU operation
FL390
Max ALT to use the APU to supply electrical power with one pack operating?
FL225