Definition
A restraint device, anchored to the aircraft structure, worn across the lap of each occupant to secure them in the seat during taxi, takeoff, landing, and any time the seat belt sign or pilot in command requires it. Required equipment under 14 CFR 91.107 for each occupant on board.
Plain English
A strap that holds you firmly in your seat so you don't move around if the airplane bumps, drops, or tips suddenly.
Context Anchor
Encountered in cockpit and passenger safety checks, especially before taxi, takeoff, landing, and in abnormal situations such as a door opening in flight.
Why Pilots Care
Keeps the pilot and passengers in place and able to maintain aircraft control if a door opens unexpectedly.
Intuition Check
Do not think of a seat belt as only crash protection. In an airplane, it also keeps the pilot and passengers in place so the airplane can be controlled safely during bumps, sudden movement, or an open-door distraction.
Example Sentence 1
Before starting the engine, the pilot confirmed every occupant had their seat belt fastened and adjusted snugly across the lap.
Example Sentence 2
During the in-flight door opening drill the student verified that the seat belt was tight across the lap.