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The engine failure take-off run is…

  • A
    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 35 ft above the take-off surface.
  • B
    1.5 times the distance from the point of brake release to a point equidistant between the point at which VLOF is reached and the point at which the aeroplane attains a height of 35 ft above the runway with all engines operative.
  • C
    the distance of the point of brake release to a point equidistant between the point at which VLOF is reached and the point at which the aeroplane attains a height of 50 ft above the runway assuming a failure of the critical engine at V1.
  • D
    1.15 times the distance from the point of brake release to the point at which VLOF is reached assuming a failure of the critical engine at V1.

Refer to figure.
CAP 698
Section 4 Data for Medium-Range Jet Transport (MRJT1)
2 Take-Off
2.1.2 The Field Length requirements specified in CS 25 are:

a) If the take-off distance includes a clearway, the take-off run is the greatest of:

i) All power units operating (dry and wet runway). The total of the gross distance from the start of the take-off run to the point at which VLOF is reached, plus one half of the gross distance from VLOF to the point at which the aeroplane reaches 35 ft, all factorised by 1.15 to obtain the net TORR.
ii) One power unit inoperative (dry runway). The horizontal distance from the brakes release point (BRP) to a point equidistant between
VLOF and the point at which the aeroplane reaches 35 ft with the critical power unit inoperative.
iii) One power unit inoperative (wet runway). The horizontal distance from the brake release point (BRP) to the point at which the aeroplane is 15 ft above the take-off surface, achieved in a manner consistent with the attainment of V2 by 35ft, assuming the critical power unit inoperative at VEF

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