specific circumstances or as required by military
standards, such as ice and snow treads.
NOTE: Additional safety precautions are
required in handling ice and snow treads.
• Rubber tread. A rubber tread is constructed
from 100-percent new (no reclaim) rubber. It maybe
new natural rubber, new synthetic material, or a blend
of new material and new synthetic materials.
• Cut-resistant tread. A cut-resistant tread has
improved cut-resistant properties that are imparted to
the tire by incorporating a barrier into the undertread
that resists penetration of cutting objects.
• Reinforced tread.
A reinforced tread is
constructed with fabric cord or other reinforcing
materials as an integral part of the tread. See figure
11-11.
• Reinforced cut-resistant tread. A reinforced
cut-resistant tread combines the features of both the
cut-resistant and reinforced-tread designs.
Ply Rating
Reference to the number of cord fabric plies in a
tire has been superseded by the term ply rating. This
term is used to identify a tire’s maximum recom-
mended load for specific types of service. It does not
necessarily represent the number of cord fabric plies
in a tire.
Most nylon cord tires have ply ratings
greater than the actual number of fabric plies in the
cord body.
Tire Rebuilding/Retreading
The rebuilding of aircraft tires has been practiced
for many years. A rebuilt tire is one that has a new
Figure 11-11.—Sectional view of two aircraft tires showing different construction details.
11-12
