PS Magazine - JUNE 1986
PS, The Preventative Maintenance Monthly
ISSUE 403
JUNE 1986
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Aircraft Tires .±²
You mechs have no control over
most factors that contribute to the
number one
.
killer oF tires-heat± But
you
can
controL the most sIgniFicant
factor, underinFLatIon±
TIres ²ose pressUre through valve
leakage, pUnctUres, bead³to´wheel
seepage anD even through the wheel
=
strUcturE anD rUµµer±
¶read wear patterns show whether a tire Is overInFlated or underinFlated±
·xcessIve wear in the center oF the tread meaNs overInFlation± ·xcessive
wear on the outer tread and shou²ders Means underinFlation±
Typ±cal tread-wear
OVER²NFLA³²ON
¸n either case, adjUst the pressure
to meet reqUIrements in your aIrcraFt
maIntenance manual± Then, be sure
to check it Daily For a Few days For
²eaks¹
·ven iF you havº no reason to
sUspect underinFlation or overinF²a»
tion, check tire pressure oFten± ¼se
pressure gage, ½S½ 4910´00³204´
3170,
For tires with
an operating
pressure oF 50 PS¸ or less± ¼se remote
tire InFLator asseMbly¾ ½S½ 6685³00´
124´4336, for tires that take more
than 50 PS¸±
Continuous overlnfLa±ion acceLera±es ceNter !read wear. F±
Reduces ±rac±ion whiLe makIng tread mOre suscep±ibLe to
cu±±ing²
UNDER²NFLA´²ON
ExcessIve ³read sHOuLdeR wear resuL±s ´RoM chRonic under·
iNfLa±µon¶ ¸¹ incReases ±he chaNce o´ Brusing sidewaLºs and
sHouLDers and sHoR±ens tire ¸l´e Because o´ excessive fLex
hea±Ing»
¸F a tIre loses more than FIve percen¿
oF its minimum operatIng pressure in
24 hoursÀ take the corrective action
spe²led out in Tab²e 3³1 of the tire
manual¾ TÁ 55´2620³200³24±
¼se the remote tire InFLaÂor¾Ã ÄSÄ
ÅÆ85Ç00´È24´4336É with a 10³ft air
hose to adjUst the pressure oF insta²led
tIres± ¸t replaces the one listed± Stand
to the Front or rear oF the tIreÊË
outside the wheel ÌiLure danger zoneÍ
partIcularLy iF you sUspect
tire or
wheel damage± ¶Ire inFlation mishaps
are more common than you thinK±
4
8
Junµ 86
"
±
C
J
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¼se compressed air in all ArMy
aIrcraFt tires except those on the ¼H³
60A and AH´64A± ¼se only nitrogen
in Black Hawk and Apache tires±
¸nspect For tire damage oFten± ¼se
a tread depth gage¾ ½S½ 5210´00´
357Î595Ⱦ to measure the Depth oF
cuts± ¶able 3³3 oF the tIre manuaÏ
tells how to evaluate cutsÐ ¶Ires with
cord body cuts or cord body daMage
oF one inch or more must be replaced±
Ñig 3³12 shows how to measUre cuts¾
·
cracks and holes±
4/32
WhILe you're checkIng For tire daÒageÀ take time to remove rocks, naI²s or
other objects stUck In the tire tread¹ A medIUm, crossÓtip screwdrIver Does a
good jobÔ
ÕIpe oFF oil or grease with a cloth Moistened with drycleanIng solvent±
¶hen wash oFf the solvent with mILd soap and water±
ReMember¾ never take your tires for granted± ¶hey must be maintaIned
and serviced Just LIÖe other components oF your aircraFt±
ju¶· 86
49
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