Aircraft tires and tubes
are designed to be tough, durable and to withstand large loads and high speeds.
They can provide years of reliable service if a few precautions are followed.
The ideal location for tire and tube storage is a cool, dry and reasonably dark
location, free from air currents and dirt. While low temperatures (not below 0
C/32 F, however) are not objectionable, room temperatures above 32 C/90 F are
detrimental and should be avoided.
Handling aircraft tires
Care should be shown when hand ling aircraft tires. While tough and durable,
tires can be damaged or cut by sharp objects or if excessive force is used. Avoid lifting tires
with convention al two prong forks of material handling trucks. Damage to bead
mounting areas or the innerliner can occur. A wide, flat, pincher type fork
assembly of the type that lifts the horizontal tire by squeezing against the
tread surface is recommended.
alternate recommended method would be using a rounded bar to lift the tire through
the center. Avoid the use of forks or other objects which have corners that
could damage the bead surfaces. When possible, handle tires by lifting or
Avoid moisture and ozone
or moist conditions have a deteriorating effect on tires and tubes, and can be
even more damaging when the moisture contains foreign elements that are further
harmful to rubber and cord fabric.
Strong air currents should be avoided, since they increase the supply of oxygen and quite often alternate recommended
carry ozone, both of method would be used a which cause rapid aging rounded bar
to lift the of rubber.
care should be taken to store tires and tubes away from fluorescent lights,
electric motors, battery chargers, electric welding equipment, electric
generators and similar electrical devices, since they all create ozone.
Store away from fuel and solvents
sure that tires do not come into contact with oil, gasoline, jet fuel,
hydraulic fluids or other hydrocarbon solvents, since all of these are natural
enemies of rubber and cause it to disintegrate rapidly. Be especially careful
not to stand or lay tires on floors that are covered with oil or grease. When
working on engines or landing gears, tires should be covered so that oil does
not drip on them.
tires accidentally become contaminated, wash them off with denatured alcohol
and then with a soap and water solution. After cleaning, be sure to remove any
water that may have accumulated in the interior of an unmounted tire. If after
cleaning, the surface of the tire appears soft, or spongy, or bulges are
present, the tire is not suitable for service. Should you have any doubt about
the serviceability of such a tire, please contact your Michelin Representative
or authorized repair station.
Store in the Dark
storage room should be dark, or at least free from direct sunlight. Windows
should be darkened with a coat of blue paint or covered with black plastic.
Either of these will provide some diffused lighting during the daytime. Black
plastic is preferred since it will lower the temperature in the room during the
warm months and permit tires to be stored closer to the window. Fluorescent or
mercury vapor lights should not be used
they generate ozone. Low intensity sodium vapor lights are recommended. See the
section on "Ozone" for more information.
possible, tires should be stored in regular tire racks which hold them up
vertically. The surface of the tire rack on which the weight of the tire rests
should be flat and, if possible, 3 to 4 inches wide to prevent permanent
distortion of the tire.
Horizontal stacking of tires is not recommended
tires are stacked horizontally, they may become distorted, resulting in
mounting problems. This is particularly true of tubeless tires. Those on the
bottom of a stack may have the beads pressed so closely together that bead
spreader tools will have to be used to properly space the beads for contact
with the wheel during initial inflation.
tires must be stacked, they should not be stacked for more than 6 months
maximum. The maximum stacking height - 3 tires high if tire diameter is greater
than 40 inches. - 4 tires high if tire diameter is less than 40 inches.
exception can be made for tires stored in boxes. Stacks of boxed tires must be
checked to ensure that the bottom boxes are not crushed.
Store tubes properly
should always be stored in their original cartons, so they are protected from
light and air currents. They should never be stored in bins or on shelves
without being wrapped in several layers of heavy paper.
can also be stored by inflating slightly (not more than 1 psi) and inserting
them in the same size tire. This, of course, should only be done as a temporary
measure. Before mounting a tire and tube stored in such a manner, always remove
the tube from the tire and inspect the inside of the tire for foreign material,
which, if not cleaned out, could cause irreparable damage to both tube and
no circumstances should tubes ever be hung over nails or pegs, or over any
other object which might form a crease in the tube. Such a crease will
eventually produce a crack in the rubber and cause tube failure.
Tire and tube age limit
aircraft tires or tubes may be placed in service, regardless of the calendar
age, provided all inspection criteria for service/storage/mounting and
individual customer imposed restrictions are met.
: Certain regulatory agencies recommend further restricting the age of rubber
products used in the aircraft industry. The decision to adopt these
recommendations must be made by the individual user.
Storage of inflated tire and wheel assemblies
storing mounted and inflated tire/Wheel assemblies, see comments in the section
on tire mounting found later in this manual.