MIL-PRF-7726K, PERFORMANCE SPECIFICATION, RETREAD TIRES, RIBBED TREAD, PNEUMATIC AIRCRAFT (20 FEB 2007) [SUPERSEDING MIL-R-7726H]., This specification covers the requirements for a retreaded bias ply or radial ply aircraft tire, which has had a worn casing restored by renewing the tread material or the tread and sidewall material. A rebuilt aircraft pneumatic tire may be a tube-type or tubeless ribbed and is intended for use on an aircraft wheel. The drawing and slash sheet matrix (shown as Table I) identifies these retreaded tires by size and ply rating.