Definition
To subject an engine, propeller, or airframe component to loads or operating conditions that exceed the manufacturer's published limits, potentially causing immediate damage or accelerated wear that shortens service life.
Plain English
Pushing a part of the aircraft harder than it was designed to handle, so it gets damaged or wears out faster than it should.
Context Anchor
Seen in adjustable-pitch propeller discussions, especially when describing how improper power or propeller speed can damage the engine or propeller.
Derivation
From 'over' (beyond) plus 'stress' (force or strain placed on something). The combined word simply means putting more strain on a part than it is built to take.
Why Pilots Care
Exceeding stress limits can cause immediate or fatigue damage leading to component failure in flight.
Intuition Check
Overstress does not mean emotional stress or ordinary hard use. It means a physical part has been pushed past its approved limit.
Example Sentence 1
On a constant-speed propeller, advancing the throttle before the propeller control can overstress the engine by allowing high manifold pressure with low RPM.
Example Sentence 2
The pilot avoided overstress by staying within the published maneuvering speed during turbulence.