Definition
A condition in which an engine, propeller, or rotating component exceeds its maximum allowable rotational speed (RPM). Overspeed can be caused by governor failure, propeller pitch malfunction, sudden load loss, or improper power management, and it can result in internal damage, structural failure, or required teardown inspection.
Plain English
The engine or propeller is spinning faster than it is built to handle. Even a brief overspeed can cause damage and usually requires inspection before further flight.
Context Anchor
Seen in powerplant operation, propeller governor discussions, maintenance records, and emergency or abnormal procedures involving engine or propeller speed.
Why Pilots Care
An overspeed can damage engine components or cause propeller failure, requiring immediate shutdown and inspection.
Grounding Statement
If the propeller or engine speed climbs past the marked limit and stays there, the aircraft is in an overspeed condition.
Intuition Check
Overspeed does not mean simply “fast.” It means faster than the approved limit for that specific engine, propeller, or part.
Example Sentence 1
After the propeller governor failed, the engine entered an overspeed condition and the pilot reduced throttle immediately to bring RPM back within limits.
Example Sentence 2
Maintenance records must note any overspeed condition before the engine can return to service.