ATPL: QNH is the Q-code to indicate:
Domanda 44, IFR Communications - ATPL - Airline Transport Pilot license
| The atmospheric pressure at aerodrome elevation (or at runway threshold) |
| The atmospheric pressure measured at the aerodrome reference point (ARP) |
| The altimeter sub-scale setting to obtain elevation when on the ground |
| The atmospheric pressure referred to the highest obstacle located on the surface of an aerodrome |
