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5 Engine anti-ice Off
6 Igniter cb Out, to prevent re-ignition when motoring engine to reduce TOT
7 Throttle Close after 2 mins, observe TOT for rise – motor the engine only to reduce TOT if it rises as part of a hot shutdown. Doing so just to provide oil flow is not approved as it can accelerate rim cracks of the 1st and 2nd-stage turbine wheels due to thermal shock.
8 Fuel Pumps Off
9 Caution Out
10 Gen/Batt Off when N1 = 0
11 Rotor brake Engage between 38-25% NR – above that is dangerous on a slippery pad, and strains the system.
Emergencies
Generator Failure
Recycle generator switches and if power is not restored, loadshed as necessary. Do not rely on the battery for more than 20 mins.
Engine Restarting In Flight
No starts should be attempted below 2000 or above 12000 feet, or if the failure is mechanical. If you don’t restart by 1000 feet, carry on with normal autorotation.
The procedure is as follows:
No Item Action
1 IAS 50 kts
2 Start/Gen switch START
3 Fuel pumps On
4 Fuel Valve On
5 Fuel pressure/contents OK
6 Throttle GI
7 Start, monitoring for fire
Hydraulic Boost Failure
Indicated by feedback forces in the cyclic when making manoeuvres, but they will be negligible if the controls are held in a fixed position. Reduce forward speed to 61-69 kts and cyclic inputs to a minimum, making necessary movements at a rate not faster than one full displacement, stop to stop, per second. Check that the Hydraulic Cb is in and that the HYD switch is on. Select the switch off if hydraulic power not restored. Carry out a run-on landing – do not try to hover.
Fuel Control and/or Governor Failure
Indicated by an unaccounted for, sustained and increasing change in N1, torque and engine power turbine/rotor RPM. Use the throttle over its full range down to Ground Idle to maintain RPM within limits. If this is successful, make an emergency landing under power, using the collective. Otherwise, close throttle and treat as for engine failure.
If you get a rundown, RPM must be kept within limits by lowering the collective, as the throttle will already be open. If this is unsuccessful, make an emergency landing with as much power as is available.
Fire
Engine Fire During Start
No Item Action
1 Starter Keep running for airflow 2 Ignition Cb Out 3 Throttle/fuel valve Close 4 Battery Off
Abandon aircraft with fire extinguisher.
Engine fire In Flight
Shut down engine, treat as for engine failure. Land as soon as possible, abandon aircraft through main cabin doors with fire extinguisher.
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