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For a multi-engine Class B aircraft, all engines operating, the take-off flight path is equal to the gross gradient of the actual flight path:
  • A
    Flown up to a height of 400 ft.
  • B
    Until reaching cruise altitude.
  • C
    Flown up to a height of 35 ft.
  • D
    Multiplied by 0.77.
  • "The gradient from 50 ft to the assumed engine failure height is the average all-engine gradient x 0.77"

The Class B net take-off flight path calculation for calculating the regulatory obstacle clearance assumes an all-engine climb to the cloud base then an engine-out climb to 1 500 ft above the aerodrome.

The all-engine gross gradient is reduced to net gradient by multiplying it by 0.77.

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