ATPL: The datum used for balance calculations is:
Domanda 88, Mass and Balance - ATPL - Airline Transport Pilot license
| Chosen on the longitudinal axis of the aeroplane, and necessarily situated between the nose and the tail of the aircraft |
| Chosen on the longitudinal axis of the aeroplane, but not necessarily between the nose and the tail of the aircraft |
| Chosen on the longitudinal axis of the aircraft, and always at the fire-wall level |
| Chosen on the longitudinal axis of the aircraft and necessarily situated between the leading edge and trailing edge of the wing |
