PS Magazine - NOVEMBER 1980
PS, The Preventative Maintenance Monthly
ISSUE 336
NOVEMBER 1980
i.
Deciding whether you have a leak In
a bearing package of a T-5
3
engIne can
create some liVely dIscussions.
The beaRing seals woRk fine during
engine
operation.
But
In
a
static
condition, some oil may dRip past the
seals and into the tail pIpe± So engIne
smoking is noRmaL when that baby is
cRanked up.
When
is
oiL
leakage
excessive?
When consumption Is more tHan 2.4
pints per houR, according to Table 4²1
³item 28³in TM 55²2840´229²24
42
(ApR 71). DaRk bRown or black burn
streaks on the rear face of the poweR
tUrbine
dIsc³not
pUddling³wIll
indicate a No±
3
bearing seal leakµ
To check foR excessive leakage, fill
up the engine oil tank before a missIon
of
1
oR 2 hours and then take a Reading
afteR the flIght±
Chances
aRe
¶
the
bearings
are
OK
±±± no engine change needed·
¸f you do have excessive oil com¹
s Ump ti on,
tho,
follow
ºhe
tRoubleshooting Info in Table 4
'
»1 of
the engine manUal.
H
OE
!
¸f the rear end of your Chinook
tends to dance up a storm when the
engines aRe cRanked up, maybe the aft
swIvel wheels aRe not locked!
¼appens½even tho the pIlot ac¾
tivates thE lock switch. Wheels cocked
a¿ an angle wonÀt locK.
So, crew chIefs, alert the pilot over
the intercom of an Unlocked wheel
beFre he staRts tÁe engInes±
To cut out any swing and sway that
mIght damage the bird, make Use of a
tUg and tow bar to straighten the
Âheels.
I
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