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An aircraft with one nose landing gear and two main landing gears is weighed on jacks. Determine the aircraft BEM and CG position, using the following readouts:

Nose landing gear, located at 161 inches from datum reading: 6448 kg
Each main landing gear, located at 795 inches from datum reading: 13 738 kg

  • A
    33 924 kg and 583.7 in from datum.
  • B
    33 924 kg and 674.5 in from datum.
  • C
    20 186 kg and 956.0 in from datum.
  • D
    20 186 kg and 592.5 in from datum.

Total mass of aircraft = 2 x 13 738 + 6448 = 33 924 kg

Moment of aircraft = 6448 x 161 + 2 x 13 738 x 795 = 22 881 548 kg.inch

CG = moment / mass

  • CG = 22 881 548 / 33 924 = 674.5 inches aft of datum

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