Originally Posted by
Kuchan
CFM56-5B
AUTOMATIC START: The maximum EGT during start sequence is 725ºC.
MANUAL START: The maximum EGT during start sequence is 725ºC.
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EGT OVERLIMIT OR STALL FAULT IN AUTOMATIC MODE:-
In case of detected stall or EGT overlimit, the FADEC monitoring and the flight crew actions are identical.
FIRST ATTEMPT
When a stall or an EGT overlimit is detected, an aural warning sounds, the MASTER CAUTION and the engine FAULT lights come on. An ECAM message appears.
The FADEC shuts off the fuel and ventilates the engine (crank time : 7 seconds).
SECOND ATTEMPT
The FADEC reduces the fuel flow and attempts a second start.
Fuel schedule reduction : 7 percent.
If the abnormality re-occurs a second time, the FADEC shuts off the fuel and ventilates the engine (crank time : 7 seconds).
THIRD ATTEMPT
The FADEC reduces the fuel flow and attempts a third start.
Fuel schedule reduction : 7 percent (a total of 14 percent).
If the abnormality occurs a third time, the FADEC shuts off the fuel and ventilates the engine (crank time : 7 seconds).
FOURTH ATTEMPT
After 7 seconds, the FADEC reduces the fuel flow again and attempts a fourth start.
Fuel schedule reduction : 7 percent (a total of 21 percent).
If the abnormality occurs a fourth time, the FADEC aborts the start.
SUMMARY
* 4 start attempts :
- a normal start
- plus 3 additional attempts.
Thanks, Is there any Crank message during the 7 second crank periods? Why no crank after the last attempt?