Definition
A gradual decline in the condition, performance, or strength of a material, component, or system over time, typically caused by wear, corrosion, fatigue, heat, chemical exposure, or environmental factors.
Plain English
Something slowly getting worse — losing strength, function, or quality bit by bit rather than failing all at once.
Context Anchor
Seen in maintenance inspections, logbook entries, material condition reports, and discussions of worn or aging aircraft parts.
Derivation
From Latin 'degradare', meaning 'to step down' (de- = down, gradus = step). The image is of something descending, step by step, from its original condition. That fits the aviation use exactly: a part doesn't fail suddenly, it steps down in condition over time.
Why Pilots Care
Recognizing degradation helps determine when parts must be repaired or replaced to maintain safety and airworthiness.
Grounding Statement
A rubber seal that becomes hard and cracked after years of heat and fuel exposure has suffered degradation.
Intuition Check
Degradation does not simply mean “old” or “dirty.” It means the item’s condition or ability to do its job has actually been reduced.
Example Sentence 1
The technician noted degradation of the rubber seals due to long-term exposure to engine heat.
Example Sentence 2
Regular inspections detect early signs of material degradation before they affect flight safety.