Glossary of Terms
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NCD - No cloud detected
NDV - No directional variation (meteorology)
Near-parallel runways. Non-intersecting runways whose extended centre lines have an angle of convergence/divergence of 15
Newton (N). The force which when applied to a body having a mass of 1 kilogram gives it an acceleration of 1 metre per
The hours between the end of evening civil twilight and the beginning of morning civil twilight or such other period.
“night” means the hours between the end of evening civil twilight and the beginning of
Nautical mile (NM). The length equal to 1 852 metres exactly.
Non-instrument runway. A runway intended for the operation of aircraft using visual approach procedures.
Normal operating differential pressure
‘Normal operating differential pressure’ means the pressure differential between the cabin