Definition
Mechanical stop positions built into a control or selector that hold it firmly in a specific setting until deliberately moved. In aviation, detents are felt as a distinct click or resistance point at fixed positions on items such as flap handles, fuel selectors, magneto switches, and throttle quadrants.
Plain English
A built-in 'click' position that locks a lever or switch into a chosen setting so it doesn't drift or move on its own.
Context Anchor
Seen during preflight when checking cockpit controls, switches, handles, and levers for proper movement and secure positioning.
Derivation
From the French 'détente,' meaning a release or trigger catch -- originally a small lever that held a mechanism in place until released. The aviation use carries that same idea: a catch that holds a control firmly until the pilot deliberately moves it.
Why Pilots Care
Ensures the pilot selects exact power or flap settings required for takeoff, climb, approach, or landing without guesswork or visual confirmation.
Analogy
A detent is like the click positions on a household fan knob. Each click is a designed stopping point, not a random place where the knob happens to pause.
Intuition Check
Do not confuse detents with dents. Detents are designed stops or click positions; dents are accidental damage.
Example Sentence 1
During preflight, the pilot moved the fuel selector through each position, feeling it click firmly into the detent for the left tank.
Example Sentence 2
The pilot placed the flap handle into the first detent for takeoff flaps and verified it locked firmly before starting the engine.