Definition
The gradual deterioration of aircraft materials and components over time due to repeated stress cycles, environmental exposure, chemical changes, and accumulated service hours, resulting in reduced strength, flexibility, or performance compared to the original condition.
Plain English
The slow wearing-out of aircraft parts and materials as they get older and are used, even when nothing has obviously broken.
Context Anchor
Seen in aircraft maintenance, inspection programs, logbook reviews, and discussions of older aircraft or long-used parts.
Derivation
From Old English 'ealdian,' to grow old. In an aviation maintenance context, it refers specifically to time-and-use-related deterioration rather than just the passing of years — an aircraft sitting unused still ages, but one in service often ages faster.
Why Pilots Care
Unmanaged aging can lead to structural failures; owners and mechanics must follow special inspection schedules to keep older aircraft safe.
Intuition Check
Aging does not simply mean “old.” In aircraft maintenance, it means the condition changes caused by time, use, and exposure; a newer aircraft with heavy use can show aging effects, while an older well-maintained aircraft may still be airworthy.
Example Sentence 1
The mechanic flagged signs of aging in the rubber fuel line and replaced it before returning the aircraft to service.
Example Sentence 2
The operator tracked flight cycles to monitor the effects of aging on the wing spars.