Aviation Glossary
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NACELLE
Definition of: NACELLE
A streamlined enclosure or housing to protect something such as the crew, engine, or landing gear. French: nacelle,from Latin, navicella,little ship.
NATIONAL AIRSPACE SYSTEM (NAS)
Definition of: NATIONAL AIRSPACE SYSTEM (NAS)
The common network of US airspace; air navigation facilities, equipment and services, airports or landing areas; aeronautical charts, information and services; rules, regulations and procedures, technical information, and human resources and material. Included are system components shared jointly with the military.
NDB
Definition of: NDB
An L/MF or UHF radio beacon transmitting nondirectional signals whereby the pilot of an aircraft equipped with direction finding equipment can determine his bearing to or from the radio beacon and "home" on or track to or from the station. When the radio beacon is installed in conjuncion with the Instrument Landing System (ILS) marker, it is normally called a Compass Locator.
