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Assuming an engine failure, after the Take-off Decision Point, of a Performance Class 1 helicopter during its take-off path with heading of 300°(M), if it intends to turn onto 330°(M) at 200 ft with a transition to IFR rules, it must be capable of clearing the obstacles vertically by an additional margin which is:
  • A
    35 ft + 1.5D + 0.01DR + an adequate margin
  • B
    35 ft + 0.01DR + an adequate margin
  • C
    35 ft
  • D
    35 ft + 0.01DR + 15 ft

According to CAT.POL.H.210 - Take-off flight path:

  1. From the end of the TODRH with the critical engine failure recognised at the TDP, the take-off mass shall be such that the take-off flight path provides a vertical distance, above all obstacles located in the climb path, of:
  • Not less than 10.7 m (35 ft) for operations under VFR.
  • Not less than 10.7 m (35 ft) + 1% of the distance travelled (DR) under IFR from the end of TODAH above all obstacles.
  1. Where a change of direction of more than 15° is made, adequate allowance shall be made for the effect of bank angle on the ability to comply with the obstacle clearance requirements. This turn is not to be initiated before reaching a height of 61 m (200 ft) above the take-off surface unless it is part of an approved procedure in the AFM.

The change of directon is: 330°M - 300°M = 30° > 15°, before reaching 200 ft and under IFR rules.

Thus, the obstacle clearance requirement is: 35 ft + 0.01DR + an adequate margin.

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