NAS - Naval Air Station (USA)
NATS - National Air Traffic Services. A division of the CAA
providing UK air traffic control.
Nav - navigation.
Nav/Com - navigation and communication.
Navaid - navigation aid.
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(s).
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.
Also SNOWTAM, a NOTAM concerning runway conditions in snow.
NOTAR - no tail rotor. A system patented by McDonnell Douglas
for maintaining directional control of helicopters without use of an
NPRM - Notice of Proposed Rule-Making (USA). Advance
publication by the FAA of proposed changes or additions to Federal Air
NTSB - National Transportation Safety Board. U.S. equivalent of
nvg - night vision goggles.
NVQ - National Vocational Qualification. A
Government-recognised qualification, the cost of training for which
can be set against tax.