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An aeroplane should have been loaded so as to give a TOM of 57 600 kg and a CG located 646 inches aft of datum (CG limits are from 640 inches to 661 inches aft of datum). However, the ground crew incorrectly loaded 900 kg of baggage into the rear cargo hold instead of the front.

If the distance between the front cargo hold and the rear cargo hold is 517 inches, is the new CG still within limits?

  • A
    Yes, it is within limits.
  • B
    No, it is out of the forward limit.
  • C
    No, it is out of the rear limit.
  • D
    Yes, it has moved forward and is within limits.

It is vital that any incorrect loading, such as loading in reverse order, is picked up by a robust visual checking process. If deviation from the loading instructions exists, then the resulting effects upon aircraft weight/balance and take-off trim settings should be determined and verified before take-off.

The following formula helps to find out by how much the CG has been moved, after loading the baggage of 900 kg:

  • Mass Change / Total Mass = Change of CG / Distance Moved.

Solving for Change of CG we get: Change of CG = (Distance Moved x Mass Change) / Total Mass = (517 in. x 900 kg) / 57 600 kg = 8.07 in.

Since, the 900 kg baggage was loaded by mistake into the rear cargo hold, instead of the front, then the CG will move further aft and its new position will be: 646 in. + 8.07 in. = 654.07 in. aft of the datum.

The aircraft's CG limits are between 640 in. and 661 in. aft of datum. Thus, the aircraft's new CG position, 654.07 in. is within limits.

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