ATR 42 Model : 400/500
CONTROLS
POWER PLANT
P 2
MAY 98
001
1.16
.
40
TRIGGERING CONDITIONS
One torque below 21 %
SEQUENCE AFTER TRIGGER
Time
ATPCS
Trigger
2.15 s
t
ARMED
ON GROUND
uptrim is triggered and
bleed valve is shut off on
the remaining engine
autofeather is activated
on the affected engine
- feather solenoid activated
- feathering electric pump
energized
- inhibition of autofeather on
the remaining engine
- ARM light extinguishes
autofeather is activated on the
affected engine
ARMED
IN FLIGHT
Note : Nothing happens on the affected engine for 2.15 seconds, but uptrim is
energized on the remaining engine. This feature enables to perform an
acceleration stop without having autofeather in order to benefit from some
reversing action on the failed engine.
In this case, the throttle reduction occuring within 2.15 seconds period
automatically disarms the mode.
Once the mode has been triggered, its cancellation can only result from either :
- PWR MGT other than TO, or
- ATPCS Pb set to OFF, or
- both PL retarded.
CAUTION :
If the engine is restarted, IT WILL BE NECESSARY TO SELECT PWR MGT
to MCT position after relight in order to be able to UNFEATHER the
propeller.
AA
R
R
AviationLearning.net
01/07//2018 REV 1 These notes are not revised after issue For Training Purposes Only
Page 730 of 764
