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bleed air valve
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft accident digest n.32. Montreal, 1993. (Cir. 232 AN/139).
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft accident digest n.21. Montreal, 1977. (Cir. 132 AN/93).
- Contexto
- Closing the bleed air valve shuts the high stage bleed air valve and reduces the engine's bleed air load supply requirements. However, given the altitude at which the airplane was flying, and the fac t that the flight engineers on two previous flights were unable to restore the engine to power under similar circumstances, the Board cannot state that the flight engineer would have been able to restore the engine to normal operation even had he closed the bleed air valve. Since the DFDR showed that the No. 4 engine did not accelerate with the other engines and remained at about 1.0 EPR until it fell below that EPR value at 1012:42, the Safety Board concludes that the No. 4 engine had not flamed out initially, but had "hung.
- This required that the bleed air valve switches which control the aircraft's pneumatic system supply remain in the closed position until after the engines had been started.
- Français
- vanne de régulation d'air de prélèvement