Definition
Replaceable pieces of material attached to a structure or component at points where it contacts, rubs against, or moves relative to another part. Wear pads absorb the friction and abrasion that would otherwise damage the underlying structure, and are designed to be removed and replaced periodically as they wear down.
Plain English
Small protective pieces fitted where two parts rub together. They take the wear so the main structure does not, and they get swapped out when they get too thin.
Context Anchor
Seen during aircraft inspections, maintenance, and parts replacement where moving panels, doors, or other parts contact nearby structure.
Derivation
From 'wear' (to gradually erode through use) plus 'pad' (a soft or protective layer placed between two surfaces). The name describes the job exactly: a pad that takes the wear.
Why Pilots Care
Ensures brakes maintain adequate stopping power; undetected wear can lead to brake failure.
Analogy
Like the rubber tip on a walking stick or the plastic glides on the bottom of furniture legs — cheap, replaceable parts that take the abuse so the main thing underneath stays intact.
Intuition Check
Do not read “wear pad” as a comfort pad or cushion for people. In aircraft use, it is a protective part designed to absorb rubbing or contact wear.
Example Sentence 1
The mechanic replaced the wear pads on the main landing gear trunnion during the annual inspection.
Example Sentence 2
The wear pads had reached their minimum thickness, requiring immediate brake service before the next flight.