(4)
Thrown tread If a tire loses part or all of its tread to the tread fabric ply : Remove the two wheel assemblies on the same axle. Send them to the workshop for an inspection or for repairs. If there is only one replacement tire, you must measure the pressure of the defective tire. If the pressure decreases less than 20% of the average pressure of the other tires on the aircraft :
-the connected tire on the same axle can stay serviceable
-when the aircraft goes back to base, remove the connected tire.
(5)
Peeled rib This condition usually starts with a cut in the tread. This causes a circumferential delamination of a tread rib, fully or partially from the tread fabric ply. You must remove the tire.
(6)
Fabric fraying The tread frays or breaks on the ply at the base of the tread groove. You must remove the tire.
(7)
Open tread splice
There is an opening in the angle tread splice across one or more
tread ribs.
You must remove the tire.
(8)
Cuts These are cuts which extend across more than 50% of a rib and deeper than 50% of the remaining groove depth. You must remove the tire if you can see any reinforcing material.
(9)
Tread flaking and chipping You can see this condition when thin pieces of rubber chip or flake from the section of tread which wears. You must remove the tire.
(10)
Tread broken away You can see this condition when there are pock marks in the section of the treads which wears. You must remove the tire if you can see any reinforcing material.
(11)
Chevron cutting Cross grooves on runway surfaces can cause a pattern of chevron-shaped cuts in the center of a tire tread. As long as this condition does not cause chunking of cuts into the reinforcing material, the tire is correct for continued service. You must remove the tire if the chevron cuts extend across more than 50% of a rib and are deeper than 50% of the remaining groove depth.
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(12)
Blister or bulges You must remove a tire with a separation of the structure in the tread or in the sidewall and send it to the retreader.
(13)
Groove craking You must remove the tire and send it to the retreader if you can see the reinforcing material through the crack at the bottom of the tread groove.
(14)
Cuts below the rib You must remove the tire and send it to the retreader if you can see cuts that extend below the tread rib.
(15)
Circumferential cracks or radial cracks You must remove the tire and send it to the retreader if you can see the reinforcing material through cracks in the sidewall of the shoulder area of the tire.
(16)
Ozone and weather checking You must remove the tire and send it to the retreader if you can see the reinforcing material through cracks caused by weather deterioration.
(17)
Skid/Flat Spot This is a flat spot on the tire wear . You must remove the tire if it is worn to the base of any groove.
Subtask 32-41-00-210-052
D. Tire Utilization Limits (MICHELIN) R (Ref. Fig. 611/TASK 32-41-00-991-030)
(1) Tread Surface
-------------------------------------------------------------------------------| OBSERVATION/DAMAGE LIMITS | CORRECTIVE ACTION | |------------------------------------------------|----------------------------| | CUTS | | | . Radial tires | | | - the metallic protector is not damaged (no | Keep the tire on the | | wires are broken) or you cannot see it. | aircraft. | | | | | - the metallic protector is damaged: | | | if CL or LL or DL is more than the limits | Remove the tire. | | given on the illustration: | | | Table for cut and puncture limits - MICHELIN| | | | |
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Table for cut and puncture limits - MICHELIN (radial tires only) R Figure 611/TASK 32-41-00-991-030
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-------------------------------------------------------------------------------
| OBSERVATION/DAMAGE LIMITS | CORRECTIVE ACTION |
|------------------------------------------------|----------------------------|
| - if a cut or injury severs or goes | Remove the tire |
| across a tread rib. | |
| | |
| . Bias tires | |
| - if casing belt plies are in view | Remove the tire |
| | |
| - if a cut or injury severs or goes | Remove the tire. |
| across a tread rib. | |
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