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During certification flight testing on a four engine turbojet aeroplane the actual take-off distances measured are: 3050 m with failure of the critical engine recognised at V1, 2555 m with all engines operating and all other things being equal. The take-off distance adopted for the certification file is:
  • A
    2938 m
  • B
    3513 m
  • C
    3050 m
  • D
    2555 m

Class A Net Take-off Distance Required

The take-off distance required is the greatest of the following three distances:

    • All engines operating. The horizontal distance travelled, with all engines operating, to reach a screen height of 35 ft multiplied by 1.15
    • One engine inoperative (dry runway). The horizontal distance from BRP to the point at which the airplane attains 35 ft, assuming the critical power unit fails at VEF on a dry, hard surface.
    • One engine inoperative (wet runway). The horizontal distance from BRP to the point at which the airplane attains 15 ft, assuming the critical power unit fails at VEF on a wet or contaminated hard surface, achieved in a manner consistent with the achievement of V2 by 35 ft.
Solution:
  • All engines operating, 2555 x 1.15 = 2938 m
  • One engine inoperative, 3050 m
The correct answer is the greater of the two values, 3050 m.

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