Definition
A maintenance procedure in which the worn or damaged tread of an aircraft tire is removed and replaced with a new layer of rubber that is bonded and vulcanized to the existing tire carcass, restoring it to a serviceable condition.
Plain English
Putting a fresh layer of rubber on a worn tire so it can be used again, instead of throwing the tire away.
Context Anchor
Seen during aircraft maintenance when fuel, oil, air, or hydraulic lines are disconnected or when openings must be protected before reassembly.
Derivation
From 'cap,' meaning a covering placed on top of something. The new tread is literally a 'cap' bonded onto the old tire body.
Why Pilots Care
Controls whether thunderstorms can form, directly affecting route selection, turbulence risk, and overall flight safety.
Grounding Statement
Rising air parcels cool and stop ascending when they reach this stable layer, ending further cloud growth.
Intuition Check
Capping does not just mean closing something casually. In maintenance, it means deliberately protecting an exposed opening from contamination or leakage.
Example Sentence 1
The main wheel tires were sent out for capping after reaching their tread wear limit.
Example Sentence 2
Before departure the pilot checked the sounding for capping that might limit storm development along the route.