Glossary

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NAFTA: See North American Free Trade Association.

Nautical mile (UK): Length of 6 080 ft or 1.85 km.

NCD: See Cargo door, nose.

Ninth Freedom or Stand Alone Cabotage: See Freedoms.

Noise: Socially unwanted sounds.

Noise abatement climb: Means of flying an aircraft from an airport so as to climb rapidly until a built-up area is reached and thereafter reducing power to maintain climb until the area is overflown or 5 000 ft is reached.

Noise footprint: The contour beneath an aircraft of constant noise level measured in decibels.

Noise restrictions: Laws concerning permitted noise levels at airports aimed at preventing disturbance to local residents, most widely felt by aircraft operators who must reduce noise levels from aircraft and airports which are restricting the type of aircraft able to land. Some airports are actively marketing the lack of noise
restrictions as a user benefit. See also Chapter III.

North American Free Trade Association: Association of USA, Canada and Mexico to promote a free trade area between the three countries similar to the EU.

Nose cargo door: See Cargo door.

NOTAM: Notice containing information essential to airport personnel connected with flight operations.