| The total mass of the aeroplane ready for a specific type of operation including crew, navigation instruments and engine cowling. |
| The mass of the aeroplane plus standard items such as unusable fuel and other unusable liquids, lubricating oil in engine and auxiliary units, fire extinguishers, pyrotechnics, emergency oxygen equipment, supplementary electronic equipment. |
| The total mass of an aeroplane ready for a specific type of operation including the required fuel and crew, but excluding traffic load. |
| The total mass of the aeroplane ready for a specific type of operation excluding unusable fuel and traffic load. The mass includes items such as crew and crew baggage. |
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