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Refer to figure.
Without the crew, the mass and the CG position of the aircraft are 7 000 kg and 4.70 m.

The mass of the pilot is 90 kg
the mass of the copilot is 75 kg
the mass of the flight engineer is 90 kg

With this crew on board, the CG-position of the aircraft will be:

  • A
    4.783 m
  • B
    4.455 m
  • C
    0.217 m
  • D
    4.615 m

Without the crew:
BEM: 7000 kg
CG: 4.7 m

Moment = Mass x CG = 7000 x 4.7 = 32900 kg.m
Pilot & Copilot mass = 165 kg
Pilot & Copilot moment = 165 x 2.045 = 337
Flight engineer mass = 90 kg
Flight engineer moment = 90 x 2.69 = 242

Total airplane mass = 7000 + 165 + 90 = 7255 kg
Total airplane moment = 32900 + 337 + 242 = 33479 kg.m

CG = moment / mass = 33479 / 7255 = 4.615 m

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