LAND AS SOON AS POSSIBLE
land at the nearest site at which a safe landing can be made
LAND AS SOON AS PRACTICABLE
extended flight is not recommended. The landing site and duration of the flight are at the discretion of the pilot.
CONTINUE FLIGHT
continue flight as planned. Repair at destination according to the Maintenance Manual.
Engine Failure Autorotation
- Set low collective pitch.
- Monitor and control rotor rpm.
- Establish approximately 65 kt (120 km/h - 75 MPH) airspeed.
- Move the fuel flow control to the shutdown position.
- According to the cause of loss of the engine:
• Re-light the engine (refer to paragraph 3.2 of this Section).
• Otherwise: close the fuel shut-off cock
switch off: the booster pumps
generator
alternator (if installed)
electrical power master “ALL-OFF” switch
(if smell of burning).
• Manoeuver to head the helicopter into the wind in final approach.
• At a height of approximately 65 ft (20 m) above the ground, flare
to a nose-up attitude. - At height 20-25 ft (6-8 m) and at constant attitude, gradually apply
collective pitch to reduce the sink-rate. - Resume level attitude before touch-down, and cancel any side-slip
tendency. - Gently reduce collective pitch after touch-down.
Engine Failure IGE Hover
Do NOT reduce pitch
Control Yaw
Cushion touchdown by increasing pitch
Reduce pitch when aircraft is on the ground
Engine Failure OGE Hover
Reduce pitch
Apply forward cyclic for airspeed according to available height
Terminate in accordance with auto rotational steps
Engine Flame Out
The symptoms of an engine failure is as follows
• Jerk in the yaw axis (only in high-power flight).
• Drop in rotor speed (aural warning sounds below 360 rpm).
• Torque at zero.
Ng falling off
to zero :
• Generator warning light illuminates.
• Engine oil pressure drop warning light illuminates.
In the event of an engine failure in flight, carry out autorotation
transition procedure (refer to paragraph 2).
Relight Engine in Flight
The normal relighting ceiling is 13000’ but relight may be attempted throughout altitude envelope.
Boost pumps - On
Wait until Ng falls below 30% then carry out normal starting procedure
In order to avoid any jerk on re-synchronization, accelerate the engine progressively, when free turbine speed approaches rotor speed
Large Drop in Fuel Flow
Same symptoms for complete engine failure but after a few seconds, Ng stabilizes at low rpm. (Less than 70%)
Establish autorotation IAS 65 knots, the advance the fuel flow control into emergency sector. Ng and T4 should rise.
If necessary, increase pitch to bring rotor speed to 380 rpm.
Trim collective pitch and fuel flow control to hold level flight at this rotor speed.
Excessive Fuel Flow Rate
Ng, T4, NR and torque increase.
Do NOT reduce collective pitch.
Reduce fuel flow until rotor speed corresponds to a position of the indicator pointer in the centre of the green area.
Continue flight with the governor out of action. Any reduction in collective pitch will cause an increase in rotor speed which must be counteracted by adjusting fuel flow.
Note
Landing approach should be made along a low gradient path, at 65 knots IAS, holding the rotor speed at the upper limit of the green area (394 rpm) using the fuel control. In final approach, reduce forward speed WITHOUT touching fuel control. The rotor speed will drop when pitch is increased on touchdown. After touchdown, reduce fuel flow control setting before reducing pitch
Surging
Surging is evidence by hunting the rpm, torque and t4 indication and jerks in the yaw axis.
Reduce the collective pitch
Note
If surging persists while fuel pressure and engine oil pressure are correct, reduce fuel flow slightly to leave the governed range. If surging still persists, LAND AS SOON AS POSSIBLE and shut down engine.
Engine Fire During Start
Close fuel shut off and apply rotor brake
Switch off boost pumps
Crank engine for 10 seconds then switch off battery
Use the nearby extinguishers
Engine Fire in Flight (Light On)
Enter Autorotation
Close fuel shut off
Boost pumps Off
Generator and alternator Off
Switch off electrical master “All Off” if smell of burning
Smoke in Cabin (Identified Source)
Shut off Corresponding System
Use extinguisher in necessary
Air the cabin
CONTINUE FLIGHT depending on system failure
Smoke in Cabin (Unidentified)
Shut off heating
If smoke does not clear:
Switch off Electrical Master “ALL OFF”
When smell of smoke has disappeared, set all switches to OFF, including the generator and alternator, close the cabin ventilators.
Reset battery switch to ON position
Reset “ALL OFF” master switch to normal position
Switch ON generator, check voltage and current
If everything is normal, switch on the circuits one by one until malfunction is identified
Tail Rotor Drive Failure
Loss of tail rotor in Power On flight results in a yaw movement to the left; the extent of such a rotation will depend on the power and speed configuration at the time of failure.
Tail Rotor Failure in Hover or Low Speed
IGE: Bring aircraft to ground by reducing pitch before yaw rate is too high.
OGE: Reduce pitch moderately, to reduce torque and simultaneously start to increase speed.
Tail Rotor Failure Forward Flight
