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The AMM gives the following guidance for tire inspections: Examine the tires for air leaks, abrasions, unusual worn areas, cuts, and flat spots.
Remove the tires that have the conditions that follow:
Examine the tires for worn areas:
NOTE: If the tread reinforcement/cut protector (steel) shows, the tire may be used without safety concerns, but if the tire is left in service you may not be able to re-tread the tire. In simple terms: Tires should be removed when tread has worn to the bottom of any groove at any spot. Tires have varying numbers of plies, and on some tires, wearing through any layers leaves too small of a safety margin. Wearing to the bottom of the groove is the best compromise point between safety and obtaining the most landings. |
All of the information, photographs & schematics from this website and much more is now available in a 374 page printed book or in electronic format. *** Updated 20 Nov 2018 *** |
Examples: Circumferential & Transverse Cuts Puncture, Rib Undercuts & Groove Cracks
From the Goodyear website: "Chevron cuts occur frequently on higher pressure tires operating on runways with cross-cut grooves. They happen primarily when the tread is still deep and will often wear off and disappear before the tire is fully worn. Despite their unattractive appearance, they are not cause for removal unless they cause tread chunking down to the fabric." Tires with chevron cuts in the tread are not serviceable if any of the single cut limits are exceeded or chunking occurs which exposes the fabric.
Tires with flat spots are not serviceable if the flat spot exceeds the tread reinforcement or cut protector plies or tire balance is affected
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