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N1: The rotational velocity of the high speed (compressor) turbine component of a gas turbine engine.

N2: The rotational velocity of the low speed (output) turbine component of a gas turbine engine.

NAVAID: Navigational Aid, a radio transmitter such as a VOR, NDB, beacon, etc. that is used for radio navigation

NC: New Colors, a term used in the flightsim community to refer to an airliner painted in the company's new or currect colors; opposite of "OC"

NDB: Non-Directional Beacon, a radio navaid that simple transmits a signal usually received by a plane's ADF to determine the direction from the plane to the NDB

NEEDLE: Jargon for the active element in a turn-and-bank indicator instrument. Also developer jargon for any visible rotating element of an FS gauge.



NONPRECISION APPROACH: An instrument approach where no electronic glideslope is provided

NORAM: Military jargon for "North America".

NORDEN BOMBSIGHT: A sophisticated WW2-era electromechanical bombsight that could be coupled into the bomber aircraft's autopilot, thereby giving the bombardier direct control of the aircraft during a bombing run. See also "second station".

NOTAM: Notice To Airmen, news of interest to pilots regarding hazards, changes in service, procedures, etc.
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NTSB: The USA's National Transportation Safety Board. Investigates accidents involving all forms of transportation, not just those involving aircraft.




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