BRIDGESTONE TIRE MANUAL - 1

thurdn · 发表于 2011-6-21 21:56:28

I. TIRE CARE AND MAINTENANCE
1. Purpose
This manual is intended to provide maintenance and
servicing information for Bridgestone aircraft tires. It is
also intended to provide in a concise format information
for safe utilization of tires, and to ensure maximum
tire life by outlining inspection, maintenance and storage
procedures for new and in-service tires.
2. Inspection Prior to Inflation
Upon receipt and before installation on aircraft wheels,
tires should be visually inspected to detect damage
that may have occurred during shipment. Check also
for absence or deterioration of sidewall markings
which may prevent positive tire identification. Ensure
that the manufacturer’s name, the tire size, ply rating,
serial number, part number, authorization number
(TSO, etc.) and fabrication date are clearly visible.
Tires with missing or illegible identification are unusable.
Before mounting, also check for permanent deformation
of tire profile or ovalization of nominal diameter
which is generally caused by unsatisfactory storage
conditions. Should deformation exist, mount the tire on
its wheel and inflate to nominal pressure. If the deformation
disappears, the tire can be used on the aircraft.
If inspection reveals a bent or kinked bead wire, the
tire is not usable.
Finally, check for contaminating agents such as oil or
grease, etc. smeared on the tire surface causing surface
deterioration. After washing with soap and water,
examine whether contaminating materials have
caused cracking or have visibly affected the rubber
causing loss of flexibility, softening or swelling in the
rubber. If so, the tire is unusable. Also, if blisters are
present and do not disappear within 24 hours, the tire
is not usable.
3. Mounting Tires on Wheels
The mounting of aircraft tires requires careful attention
and adherence to established procedures. Care
should be taken to abide by wheel/airframe manufacturer’s
instructions for assembling wheels and mounting
tires.
Bridgestone commercial aircraft tires are tubeless. It is
prohibited to mount these tires with an inner tube
unless otherwise specified.
It is recommended to mount without grease or lubricating
agents on the tire bead area. A tire with adjusted
balance is stamped with a red dot on the sidewall
immendiately above the bead to indicate the lightweight
point of the tire.
The following step-by-step instructions generally apply
for mounting tubeless tires on split wheels:
1) Make sure that the tire is clean inside. Visually
inspect the bead area and wipe it clean with a
cloth moistened with denatured alcohol, allowing
the tire to dry.
2) Wipe the bead seat and O-ring seal area of the
wheel halves with an alcohol dampened cloth.
Lubricate the O-ring seal with a light coat of
grease following manufacturer’s instructions, if
any. Place seal carefully in its groove without
strectching or twisting.
3) Place the tire on the inboard wheel half being careful
not to disturb the O-ring. Align red balance dot
on tire with the wheel valve or if indicated on the
wheel, with the wheel’s heavy point.
4) Place outboard wheel half inside the tire. Align bolt
holes following manufacturer’s instructions.
5) Install wheel bolts, washers and nuts, draw up in a
criss-cross fashion, and torque according to the
wheel manufacturer’s instructions.
2
4. Inflation in the Tire Shop
Aircraft tires are designed to operate at a specific
deflection. When tires are used with incorrect inflation
pressure, tire durability can be seriously affected. Not
only may tire resistance to flexing fatigue decrease,
but also problems such as tire burst or separation may
occur.
A. Recommended Inflation procedures
Inflate tire with nitrogen in a safety cage to Rated Inflation
Pressure. Check for leaks. Nitrogen is the recommended
inflation medium as it prevents combustion
which can occur with oxygen and reduces degradation
of the innerliner due to oxidation.
When a new tire with a nylon carcass is mounted on a
rim and is inflated, the nylon cord will stretch or grow,
causing the inflation pressure of the new tire to
decrease. Consequently, the inflated tire must be stabilized
for a given period (refer to Table 1), and the
pressure adjusted again to rated pressrue.
This procedure requires a pressure gauge of 0.25 percent
accuracy or better and capability to indicate a
pressure change of 2psi.
Table 1: Period for Stabilization
* : ”Min. 12hours” for the stabilization is recommended in AC 20-
97B issued by FAA.
After the initial stabilization period, the tire must be
capable of retaining inflation pressure with a loss of
pressure not exceeding the criteria specified below.
(refer to Table 2) Then unloaded service pressure
(PNO) can be used as the initial pressure.
Table 2: Air Retention Criteria
** : ”Min. 24hours” for the retention test is recommended in AC 20-
97B issued by FAA.
Should the pressure drop

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