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A skidded helicopter has been landed on a hill with its nose towards the upslope. Because of its too far aft Centre of Gravity, the helicopter starts to slide downhill with the risk of a tail strike. What action should be taken by the Pilot?

  • A

    Raise the collective lever and apply forward cyclic.

  • B

    Raise the collective lever only.

  • C

    Raise the collective lever and apply aft cyclic.

  • D

    Lower the collective lever and apply forward cyclic.

A helicopter landing upslope with a too far aft Centre of Gravity is subjected to a "Static Rollover".

In general, Static Rollover can occur when a helicopter comes to a rest on an excessively steep slope, causing the Centre of Gravity to fall outside the down slope skid or wheel in case of a cross-slope landing, or causing the Centre of Gravity to fall outside the down slope edges of the skids or down slope wheels in case of an upslope landing.

For this question, the too far aft CG makes the helicopter initially to slide down the hill and, if a recovery action is not applied on time, the CG will fall outside the down slope edges of the skids with the risk of a tail strike.

The recommended recovery action in this case is to raise the collective lever and apply forward cyclic simultaneously, so as to prevent a further sliding downhill and bring the helicopter to a hover.

If the collective lever is raised without forward cyclic application, the condition may become worse, since the backwards tilted rotor disc will enhance more the sliding downhill tendency.

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