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high torque input drive clutch engagement may
cause severe engine and/or drive train damage. A sudden
engagement is indicated by a loud noise and/or a
sudden increase in engine torque. Should an input
drive clutch fail to engage, perform the following:
a. In Flight.
1. PWR lever (affected engine) -- IDLE.
If NP (affected engine) does not drop below NR:
2. LAND AS SOON AS POSSIBLE.
If NP (affected engine) goes below NR:
3. EMER ENG SHUTDOWN (affected engine
only).
4. LAND AS SOON AS PRACTICABLE.
b. On Ground.
CAUTION
Do not shutdown both engines simultaneously.
1. EMER ENG SHUTDOWN (affected engine
only)
2. Check NG is less than 10% (affected engine)
3. Perform normal engine shutdown.
9.9.7 High RPM Rotor (Warning Light On) NP Failed
High.
1. Collective -- Adjust to Maintain Nr within limits.
If condition persists:
2. PWR lever (affected engine) -- Retard to
equalize torque on both engines.
3. LAND AS SOON AS PRACTICABLE.
TM 1-1520-238-10
9.9.8 Low RPM Rotor (Warning Light On) Np Failed
Low.
1. Collective - Adjust to maintain Nr within
limits.
If condition persists:
2. PWR lever (affected engine) LOCKOUT
then retard to equalize torque output of both
engines.
NOTE
Advancing the PWR lever of the engine with
low torque and TGT to LOCKOUT locks out
the signal from the ECU 701 or DECU 701C.
The engine must be controlled manually to
ensure that it does not exceed operating
limits.
If manual control is not possible:
3. PWR lever (affected engine) IDLE.
4. LAND AS SOON AS PRACTICABLE.
9.10 FIRES.
The safety of the helicopter occupants is the primary
consideration when a fire occurs. On the ground, it is
essential that the engine(s), and APU be shut down, the
crew evacuated, and fire fighting begin immediately. If
time permits, a MAYDAY radio call should be made
before electrical power is OFF to expedite assistance
from fire fighting equipment and personnel. If airborne,
the most important single action that can be taken by the
i crew is to land the helicopter. Consideration should be
given to jettisoning external stores prior to landing.
NOTE
· The PRI bottle should be selected first; in
the event of a malfunction or failure to
extinguish the fire, select RES.
· The fire bottle discharge switch directly
associated with the fire handle pulled must
be used to dispense extinguishing agent.
·· If the APU is running, accomplish an APU
shutdown prior to evacuating the aircraft.
9.10.1 Engine/Fuselage Fire on Ground. If ENG FIRE
PULL handle illuminates or if fire is observed:
1. PWR levers OFF.
2. Illuminated ENG FIRE PULL handle Pull if
applicable.
3. FIRE BTL switch Activate if applicable.
9.10.2 APU FIRE PULL Handle Illumination in Flight.
An APU FIRE PULL handle illumination in flight may be
an indication of a fire in the transmission area. If the fire
is in the transmission area, pulling the APU FIRE PULL
handle and discharging the fire bottles may have little or
no effect on the fire.
1. APU FIRE PULL handle - Pull
2. ECS Off
3. LAND AS SOON AS POSSIBLE.
9.10.3 APU Compartment Fire. If fire is observed in
APU compartment or if APU FIRE PULL handle on pilot
right console illuminates:
1. APU FIRE PULL handle - Pull
2. FIRE BTL switch Activate.
3. ECS Off
9.10.4 Engine Fire in Flight.
1. PWR lever (affected engine) OFF.
2. Illuminated ENG FIRE PULL handle Pull.
3. FIRE BTL switch Activate.
4. LAND AS SOON AS POSSIBLE.
9.10.5 Electrical Fire in Flight. Prior to shutting off all
electrical power, the pilot must consider the equipment
that is essential to a particular flight environment which
will be affected; e.g., flight instruments, flight controls,
etc. With electrical power off, engine anti-ice is
automatically on. If an immediate landing cannot be
made, the defective circuit may be isolated by selectively
turning off electrical equipment and/or pulling circuit
breakers.
1. GEN 1 and 2 switches OFF.
2. LAND AS SOON AS POSSIBLE.
9-12 Change 6
pGq
Abort Start for any of the following reasons:
J l If it becomes apparent that TGT will exceed
852 “C before NG idle speed (63% or
more) is attained.
l If TGT does not increase within 45 seconds
after moving PWR lever to IDLE.
l If no Np within 46 seconds after moving
PWR lever to IDLE unless rotor is
locked.
l If positiGe oil pressure indication does
not occur within 45 seconds after moving
　
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