Definition
A specially shaped nose-wheel tire fitted with a built-in flange or lip on the sidewall that deflects water and slush sideways, away from the engine intakes of aft-mounted jet engines during takeoff and landing.
Plain English
A nose-wheel tire with a curved lip on its side that throws water and slush outward instead of letting it spray straight back into the engines.
Context Anchor
You may see chine tires on aircraft whose engines or other sensitive areas are close to the spray path from the nose wheel, especially some jet aircraft.
Derivation
The word 'chine' originally meant a backbone or ridge, and is also used in boatbuilding to describe the angled edge where the bottom of a hull meets the side. The tire borrows the term because it has a similar raised ridge running around the sidewall.
Why Pilots Care
Reduces water spray ingestion into the propeller or engine intake and improves directional control on the water surface.
Grounding Statement
Picture the nose tire rolling through standing water and the raised ridge throwing the spray outward instead of straight back toward the airplane.
Intuition Check
A chine tire is not a tire made from a special rubber compound or a tire used only in one country. The key feature is the raised ridge that redirects spray and debris.
Example Sentence 1
The aircraft was fitted with chine tires on the nose gear because its engines were mounted on the rear fuselage.
Example Sentence 2
During the preflight walk-around the mechanic checked that the chine ridge on each tire was undamaged.