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be operative.
Two different reactions can occur depending if the engine
with the failed FADEC went into fixed fuel flow at a high
fuel flow or a low fuel flow.
In a high fuel flow situation, the FADEC on the non malfunctioning
engine may cause the non malfunctioning
engine to drop off line in an effort to maintain 100 percent
NR (since the failed engine has a high fixed fuel flow).
TM 1-1520-240-10
9-1-19
Conversely, if the failure occurred at a low power setting,
the malfunctioning engine will provide little or no power
upon demand. These indications must be confirmed by
observing the engine instruments display since the nonmalfunction
engine could have low or high torque in comparison
to the fixed fuel flow engine.
This fixed fuel flow condition may cause an increase in
NR when THRUST CONT lever is reduced. Another indication
would be a split in TQ with upward or downward
THRUST CONT applications.
This fixed fuel condition may be capable of providing
partial power at THRUST CONT application depending
on the power that was required when the system sustained
the hard failure.
Failure of the REV engine control system to a fixed fuel
flow may require the engine to be shutdown at some
point before landing to prevent NR overspeed. Once the
decision is made to shut down the engine and prior to
pulling the T handle with the ENG COND lever in the FLT
position, the pilot may attempt to regain control of the
FADEC by toggling the FADEC switch from PRI to REV
and back to PRI without hesitation between switch positions.
If the REV light is illuminated, the engine may not restart
after shut-down.
During Reversionary operation, there may be loud reports
from the engine during low power condition including
a bleed band malfunction. If this is encountred, minimize
low power conditins on affected engine.
9-1-22. 714A REV 1 and/or REV 2 (WITHOUT) ASSOCIATED
FADEC LIGHT(s) ON.
CAUTION
Do not manually select reversionary mode
on affected engine as uncommanded power
changes may occur.
9-1-23. 714A REV 1 or REV 2 (WITH) Associated
FADEC LIGHT ON.
The FADEC of the non affected engine will attempt to
maintain 100% RRPM. If engine shutdown is required,
positively identify the affected engine by observing engine
instruments.
1. Land as soon as possible.
2. EMER ENG SHUTDOWN — As required.
9-1-24. 714A REV 1 and REV 2 (WITH) Associated
FADEC LIGHTS ON.
With both FADEC and REV lights illuminated, no engine
or RRPM control will be provided by the FADEC. The
decision to shutdown the engine(s) should be based on
RRPM and fixed power output, keeping in mind the power
required for touchdown.
1. Land as soon as possible.
2. EMER ENG SHUTDOWN — As required.
9-1-25. Engine Transmission Clutch Failure to
Engage.
An engine transmission clutch failing to engage is most
likely to occur when the engine condition lever is advanced
from GND to FLT or during engine start. The
indications of an engine transmission clutch failing to
engage are: a loss of torque indication for an engine or
erratic torque indications for an engine or failure of the N1
of an engine to accelerate past 70 percent N1 when
advancing the ENG COND lever to FLT. A sudden high
torque clutch engagement may cause severe engine and/
or drive train damage. A sudden engagement is indicated by
a loud noise and/or a sudden large increase in engine torque.
Should the engine transmission fail to engage, perform
the following:
WARNING
Do not shutdown both engines simultaneously.
Maintain RRPM with the engaged
engine until affected engine N1 reaches zero
(0).
1. EMER ENG Shutdown — (Affected engine).
When N1 reaches (0):
2. EMER ENG Shutdown — (engaged engine).
9-1-26. Engine Shutdown — Complete Electrical
Failure.
F 1. FUEL VALVE #1 and #2 ENGINE —
CLOSE.
2. Normal shutdown — Perform.
9-1-27. Engine Shutdown — Condition Lever Failure.
Should the engine condition lever fail to shut down or
control an engine, use the following procedure for engine
shutdown.
1. FIRE PULL handle (affected engine) —
Pull.
2. Normal shutdown — Perform.
TM 1-1520-240-10
9-1-20
9-1-28. Engine Shutdown with APU or APU Generator
Inoperative.
CAUTION
When the rotors stop turning, no hydraulic
pressure is available to motor the engines.
In the event of internal engine fire when
engine motoring cannot be accomplished,
use fire extinguishing equipment as necessary
　
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