217.187
Figure 11-27.—Rapid tread wear caused by
overinflation.
This not only scuffs off the thread, but also causes
internal separation of the cords. Always be sure the
aircraft is moving before you attempt a turn. This
allows the tire to roll instead of scrape.
You should make every effort to prevent oil,
grease, hydraulic fluid, or other harmful materials
from coming in contact with the tires. When there is
a chance that harmful materials may come in contact
with the tires during maintenance, they should be
protected by covers. To clean tires that have come in
contact with oil, grease, or other harmful material,
you should use a brush or cloth saturated in a soap
and water solution. Rinse well with tap water.
Uneven Tread Wear
If a tire shows signs of uneven or excessive tread
wear, the cause should be investigated and the
condition remedied before the tire is ruined. Some of
the common causes of uneven tread wear are
217.188
Figure 11-28.—Rapid tread wear caused by
misalignment.
underinflation, overinflation, misalignment, and
incorrect balance.
UNDERINFLATION.—Underinflation causes the
tire to wear rapidly and unevenly at the outer edges
of the tread, as shown in figure 11-26. An
underinflated tire develops higher temperatures
during use than a properly inflated tire. This can
result in tread separation or blowout failure.
OVERINFLATION.—Overinflation reduces the
tread contact area, causing the tire to wear faster in
the center, as shown in figure 11-27. Overinflation
increases the possibility of damage to the cord on
impact with foreign objects and arresting cables on
the runway or flight deck.
MISALIGNMENT.—Figure 11-28 shows rapid
and uneven tire wear caused by incorrect camber or
11-27
