Today's Aeronautical Terms

The time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the American Air Almanac, converted to local time.
[Source: Pilot/Controller Glossary]

Minimum unstick speed.
[Source: TITLE 14--Aeronautics and Space]

An occurrence or operation that results in less than prescribed separation between aircraft, or between an aircraft and a vehicle, pedestrian, or object.
[Source: Instrument Procedures Handbook]

Stability about an aircraft’s vertical axis. Also called yawing or directional stability.
[Source: Handbook of Aeronautical Knowledge]

This type of hypoxia is a result of insufficient oxygen available to the lungs. A decrease of oxygen molecules at sufficient pressure can lead to hypoxic hypoxia.
[Source: Handbook of Aeronautical Knowledge]