Definition
A mechanical latching device that holds the nose landing gear securely in the retracted (up) position inside the wheel well during flight, preventing it from falling free under its own weight or aerodynamic loads until the pilot commands gear extension.
Plain English
A latch that keeps the front wheel locked up inside the airplane after it has been retracted, so it stays put during flight.
Context Anchor
Seen during preflight inspection of retractable-gear airplanes and in descriptions of how the landing gear system works.
Derivation
Combines 'nose gear' (the front landing gear leg under the airplane's nose) with 'uplock' — a lock that holds something in the up position. The opposite is a 'downlock,' which holds the gear extended for landing.
Why Pilots Care
A failed nose gear uplock can allow the gear to extend or partially drop in flight, creating drag, increasing fuel burn, and creating an unsafe condition for landing.
Intuition Check
Do not think of the uplock as just a cockpit light or an indication. It is a physical part that holds the nose gear in the up position.
Example Sentence 1
During preflight, the pilot inspected the nose gear uplock for signs of wear or hydraulic leakage before the first flight of the day.
Example Sentence 2
After liftoff the pilot confirmed the gear was up and the nose gear uplock had engaged before accelerating to climb speed.