aerospace
347 abbreviations
| Abbreviation | Meaning | |
|---|---|---|
| MLS | microwave landing system | |
| MM | middle marker | |
| MMEL | master minimum equipment list | |
| MOC | minimum obstacle clearance | |
| MP | manifold pressure | |
| MRB | Material Review Board | |
| MRO | maintenance repair overhaul | |
| MRP | Material Resources Planning | |
| MRW | maximum ramp weight | |
| MSA | minimum safe altitude / minimum sector altitude | |
| MSDS | Material Safety Data Sheet | |
| MSL | mean sea level | |
| MSLW | Max. Structural Landing Weight | |
| MSTOW | Max. Structural Take-off Weight | |
| MSZFW | Max. Structural Zero Fuel Weight | |
| MTOW | maximum take-off weight | |
| MZFW | maximum zero-fuel weight | |
| NDB | Non-directional beacon | |
| NDT | Non-destructive testing | |
| NOTAM | notice to airmen | |
| OBE | overcome by events | |
| OBS | omni-bearing selector | |
| OCA | obstacle clearance altitude | |
| OCH | obstacle clearance height | |
| OEM | original equipment manufacturer | |
| OIS | Obstacle identification surface | |
| OM | outer marker | |
| OTS | out of service | |
| OW | operational weight | |
| P | (as a prefix:) prohibited airspace | |
| PANS-OPS | procedures for air navigation services – aircraft operations | |
| PAPI | precision approach path indicator | |
| PAR | precision approach radar | |
| PBD | place bearing distance (RNAV waypoint) | |
| PDAS | public domain aeronautical software | |
| PDG | procedure design gradient | |
| PET | point of equal time | |
| PF | pilot flying | |
| PFAF | precision final approach fix | |
| PFD | primary flight display | |
| PIO | Pilot Induced Oscillations | |
| PIREP | Pilot Report | |
| PM | pilot monitoring | |
| PNF | pilot not flying | |
| POH | Pilot's Operating Handbook | |
| PSR | point of safe return | |
| PSR | power supply reset | |
| PSU | personal service unit | |
| QFE | the Q-code for: Atmospheric pressure at aerodrome elevation (or at runway threshold) | |
| QNH | the Q-code for: Altimeter sub-scale setting to obtain elevation when on the ground, i.e. altitude above MSL |