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During certification test flights for a turbojet aeroplane, the actual measured take-off runs from brake release to a point equidistant between the point at which VLOF is reached and the point at which the aeroplane is 35 feet above the take-off surface are:

1747 m, all engines operating
1950 m, with the critical engine failure recognised at V1, the other factors remaining unchanged.

Considering both possibilities to determine the take-off run (TOR). The certificated value of the Take-off Run is:

  • A
    2009 m.
  • B
    2243 m.
  • C
    2096 m.
  • D
    1950 m.
CS 25.113 Take-off distance and take-off run
(1) The take-off run on a dry runway is the greater of –
(i) The horizontal distance along the take-off path from the start of the take-off to a point equidistant between the point at which VLOF is reached and the point at which the aeroplane is 11 m (35 ft) above the take-off surface, as determined under CS 25.111 for a dry runway; or
(ii) 115% of the horizontal distance along the take-off path, with all engines operating, from the start of the take-off to a point equidistant between the point at which VLOF is reached and the point at which the aeroplane is 11 m (35 ft) above the take-off surface, determined by a procedure consistent with CS 25.111. (See AMC 25.113(a)(2), (b)(2) and (c)(2).)

Considering the above, the take-off run will be the greater of:
  • All engines distance x 1.15
    1 747 m x 1.15 = 2009 m; or
  • OEI distance
    1 950 m

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  • Austro Control