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At the flight preparation stage, the following parameters in particular are available for determining the mass of the aircraft:

1- Dry Operating Mass
2- Operating Mass

Which statement is correct:

  • A
    The Operating Mass is the mass of the aircraft without take-off fuel.
  • B
    The Dry Operating Mass includes special operational equipment needed to carry out a specific flight.
  • C
    The Dry Operating Mass includes take-off fuel.
  • D
    The Operating Mass includes the traffic load.
Dry Operating Mass (DOM)
The total mass of an aircraft ready for a specific type of operation excluding all usable fuel and traffic load. This mass includes items, such as:

• Crew, crew baggage, engine oil, unusable fuel.

Operating Mass (OM)

It is the DOM plus takeoff fuel but without traffic load.
• Operating Mass = DOM + Fuel. It does not include traffic load.

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