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An engineer compares a competitor's manufacturer's empty weight with their own operating empty weight. The comparison is

  • A.Valid if both aircraft are the same size
  • B.Valid for transports only
  • C.Invalid; the definitions differ
  • D.Valid and useful

Answer: C

Correct answer: Invalid; the definitions differ

Manufacturer’s empty weight is the aircraft as built; operating empty weight adds crew, oil, catering and emergency equipment, and can be several tonnes higher on a transport. Comparing one against the other flatters whichever aircraft is quoted on the lower definition. Weight comparisons are only meaningful when both figures are on the same definition, which is why weight statements name it explicitly.

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