12/29/2025
If you know someone that is trying to get their A&P. This is an amazing site for information.
If you are provided a tire like this one on your practical test, can you dispatch or not dispatch, and why? If you have taken the Michelin Tire Expert training on line, or if you have read the chapter 13 on tires in the FAA Airframe handbook you should know the answer off hand. I happen to use the Michelin Tire manual as data on tire projects.
Tread
The tread is the crown area of the tire designed to come in contact with the ground. It is a rubber compound formulated to resist wear, abrasion, cutting, and cracking. It also is made to resist heat build-up. Most modern aircraft tire tread is formed with circumferential grooves that create tire ribs. The grooves provide cooling and help channel water from under the tire in wet conditions to increase adhesion to the ground surface.
Tread Depth & Wear Pattern
Evenly worn tread is a sign of proper tire maintenance. Uneven tread wear has a cause that should be investigated and corrected. Follow all manufacturer instructions specific to the aircraft when determining the extent and serviceability of a worn tire. In the absence of this information, remove any tire that has been worn to the bottom of a tread groove along more than 1⁄8 of the circumference of the tire. If either the protector ply on a radial tire or the reinforcing ply on a bias tire is exposed for more than 1⁄8 of the tire circumference, the tire should also be removed. A properly maintained evenly worn tire usually reaches its wear limits at the centerline of the tire.
Reference the FAA Airframe Mechanic Handbook FAA-H-8083-31B, Chapter 13, page 13-79 for more information.