Definition
A rapid, repetitive vibration or oscillation in a mechanical component, often producing an audible buzzing or rattling, caused by intermittent contact, improper clearance, worn parts, or insufficient damping. In aircraft systems, chatter commonly appears in brakes, control surfaces, hydraulic valves, and landing gear components.
Plain English
A fast, shaky, buzzing motion in a part that should be moving smoothly. It usually means something is loose, worn, or not adjusted right.
Context Anchor
Seen in maintenance discussions about drilling, cutting, grinding, brakes, bearings, control surfaces, or any aircraft part that should move or contact another part smoothly.
Derivation
From the everyday word 'chatter,' meaning rapid clicking or shaking sounds (like teeth chattering). The mechanical use borrows the same idea: a fast, repetitive shaking that you can often hear as well as feel.
Why Pilots Care
Unresolved chatter signals mechanical wear or imbalance that can progress to control-surface failure or loss of braking effectiveness.
Grounding Statement
If a part should move smoothly but instead rapidly shakes, skips, or grabs, that behavior is chatter.
Intuition Check
Chatter does not mean casual talking here. In aircraft maintenance, it means unwanted rapid vibration, rattling, or repeated grabbing.
Example Sentence 1
The pilot reported brake chatter during the landing rollout, so the technician inspected the brake assemblies for worn linings and loose hardware.
Example Sentence 2
Aileron chatter appeared at cruise speed and disappeared after the control-rod bearings were replaced.