Aerospace Acronyms: N
| Acronym | Definition |
|---|---|
| NBAA | National Business Aircraft Association, USA. |
| NDB | Non-Directional Beacon. A medium-frequency navigational aid which transmits non-directional signals, superimposed with a Morse code identifier and received by an aircraft's ADF. |
| NM | Nautical Mile. |
| NOE | Nap Of Earth. Low flying, usually by the military, using contour-flying techniques and terrain-masking to avoid being seen. |
| NORDO | No Radio (used on flight plan form). |
| NOSIG | No Significant Change, term used on Met reports. |
| Notam | Notices to Airmen, issued by the CAA (and equivalent authorities elsewhere) to inform pilots of new or changed aeronautical facilities, services, procedures or hazards, temporary or permanent. |
| NOTAR | No Tail Rotor. A system patented by McDonnell Douglas for maintaining directional control of helicopters without use of an anti-torque tail rotor. |
| NPRM | Notice of Proposed Rule-Making (USA). |
| NTSB | National Transportation Safety Board (U.S. equivalent of UK AAIB). |
