Definition
A range of input values around a control system's reference point within which no output response occurs. The system ignores small deviations inside this range and only reacts when the input moves outside it.
Plain English
A small zone where nothing happens. The system waits until the change is big enough to matter before it does anything.
Context Anchor
Seen in discussions of aircraft control systems, autopilots, trim systems, sensors, and instruments that should not react to every tiny movement or signal change.
Derivation
From 'dead' (inactive, unresponsive) plus 'band' (a range or zone). Together: a zone where the system is intentionally inactive.
Why Pilots Care
Excessive deadband can delay control response or allow unwanted oscillation, affecting handling precision and stability.
Analogy
A car steering wheel may move a tiny amount before the car actually begins to turn. That small no-response area is like a deadband.
Intuition Check
Deadband does not mean the system is dead or failed. It means there is a small range where the system is not supposed to respond.
Example Sentence 1
The autopilot's deadband kept it from chasing every small bump in turbulence.
Example Sentence 2
Increasing the deadband on the pitch axis reduced the aircraft's tendency to oscillate in level flight.