In calculations with respect to the position of the centre of gravity a reference is made to a datum. The datum is
Domanda 84, Mass and Balance - ATPL - Airline Transport Pilot license
| A reference plane which is chosen by the aircraft manufacturer. Its position is given in the aircraft Flight or Loading Manual. |
| Calculated from the data derived from the weighing procedure carried out on the aircraft after any major modification. |
| An arbitrary reference chosen by the pilot which can be located anywhere on the aircraft. |
| Calculated from the loading manifest. |
