Avionics ventilation Flashcards
1
Q
Avionics ventilation …
A
The ventilation system provides cooling through ambient air extraction, to limit the internal operating temperature of the electronic equipment (LH side).
2
Q
EXHAUST MODE - NORM
A
– On ground, ENG 1 off: extract fan on. OVBD valve full open, U/F valve closed
– Air/ground, ENG 1 on: extract fan operates. OVBD valve closed. U/F valve opened
3
Q
EXHAUST MODE - FAULT
A
Fan failure/ overheat (fan inhibited for 120 s. after eng start or after a GPU power on. AIR on CAP)
4
Q
EXHAUST MODE - OVBD
A
- extract fan off
- OVBD valve partially opened (in flight only). U/F valve closed
5
Q
OVBD VALVE
A
- AUTO except for emergency
- Direct control of OVBD valve.
- The full open position is possible only if the delta P is smaller than 1 PSI
6
Q
OVBD VALVE - FAULT
A
OVBD valve in disagreement with ovbd valve SW position