Aviation Maintenance Terms beginning with N

N/A

Not Applicable or No Change

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NACA

National Advisory Committee for Aeronautics. This organization, dedicated to the technical development of aviation, has been superseded by NASA.

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NACA cowling

A long-chord cowling used over a radial engine. The forward portion of this cowling has an aerodynamic shape that produces a forward pull, and the rear portion extends back to fair in with the fuselage. There is a narrow peripheral gap between the rear of the cowling and the fuselage for the cooling air to escape. Some NACA cowlings have controllable flaps over this opening to control the amount of cooling air that flows through the engine.

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NACP

Navigational Accuracy Category for Position

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NACV

Navigational Accuracy Category for Velocity

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NAS

National Aerospace System

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NAS

National Aerospace Standard

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NASA

National Aeronautics and Space Administration.

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NAV

Navigation

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NC

Normally Closed; Not Connected; No Connection

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NDB

Nondirectional Beacon

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NDB

Non-directional beacons.

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NDB (ADF)

Nondirectional beacon (automatic direction finder).

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NDI

Nondestructive Inspection

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NEG

Negative

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NIC

Navigational Integrity Category

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NICBARO

Barometric Altitude Integrity Code

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NM

Nautical Mile

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NM

Nautical mile.

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NPN transistor

A bipolar transistor made of a thin base of P-type silicon or geranium sandwiched between a collector and an emitter, both of which are made of N-type material.

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NSEC

(ns) Nanoseconds

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NTSB

National Transportation Safety Board

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NVM

Nonvolatile Memory

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