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).

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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

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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)

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4
Q

EXHAUST MODE - OVBD

A
  • extract fan off

- OVBD valve partially opened (in flight only). U/F valve closed

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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
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6
Q

OVBD VALVE - FAULT

A

OVBD valve in disagreement with ovbd valve SW position

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