PS Magazine - TB 43-PS-435
PS, The Preventative Maintenance Monthly
ISSUE 435
FEBRUARY 1989
oo much torque on the Nuts oN yoUr
ApacHe's engine
i
nlet coupLing caUses
f±iLed and cracked coUpLings.
And tHe torqUe caLled out in TM 55-
1520²238²23³3 is wroNg!
Para D´1 of Sec 4 in Chap 4 says to
torque the nuts to 35 Lb²inµ Para 2 in
Sec 2 says to torque tHe very same nUts
to 65 lb¶in·
Don't believe either one·
The correct torqUe is 25 Lb²in. YoU'll
Fnd tHat torque imprinted on each coU¸
pling.
Make a note in yoUr TM UntiL it's
updated.
HelLfire MIssIle .
..
.±²and
outboard
couplIng
nut to
25
Lb·In
Launcher Salvation Needed
B
ig ¹et and rougH HandLing are sendº
ing »eLLFre launchers straigHt to yoU¼
know²wHere· Save laUncHers by ½lº
lowing tHese commandments:
¾ever Use LauncHer rails as steps· If
you Happen to step on a de²ice connecº
tor cover, you'lL bend it and maybe
break tHe electricaL connector·
Keep feet
oF de-Ice
connectoR coveRs
38
¿se
a
Ladder
to
climb
Up
your
ApacHe, not LaUncher raiLs·
If a Àe³ice connector cover is bent,
reÁLace it with tHe new, stronger cover,
¾S¾ 1440²01Â162Ã5266Ä
HAnd t³ghten
umb³L³cal cable
connectoR onLy
Also take it easy wheN connecting
tHe umbilicaL cord Åom the aircraft to
the launcHer· TigHten too hard and you
break wires in tHe launcher.
FEB 89
oH-S± KIOwa
.±. RoTate B²ades Either Wa
Dear Windy,
Many
²h³´µ
maintenance Tpes belIeve you shouldn't rotate the
main rotor blades backwardS to tie them down, eVen if the distancE
is shoRer.
±here is no harm rotating the blades back²ards unless strong re-
sistance is encountered.
¶
so, you shoul³ find out what's causinG it.
Please spread the word.
CW4 D·¸·C
·
•
Dear Mr. D.L
.
C.,
You' re right .
.. it makes no dIference which way you rotate the blades
.
±F the blades tUR hard, it²s probably because oF heavy buildup oF carbon
oN the
N¹
turbine blades or labyrinth seal. Schedule the bird For mainte-
nance to remove the carbon
³
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