PS Magazine - TB 43-PS-422
PS, The Preventative Maintenance Monthly
ISSUE 422
JANUARY 1988
AH-1 .
.±
Handle Blades with Hands
If you're throwing a Rop over
K747-03±2²5 m
rotor blades to Psition
TEm Fr ±iE-down, quit!
²hose BLadEs
h
an erosion guard on the leading ³ge tha±'s easiLy damag³.
So ´uµ u´ a maintenance ´latform or ladder
and Psition the bLades by hand¶
U²21 Series ³´³
·etter yEt, get a buddy
t
climb u´ to´ and ti´ ±he
bLades to one side so you
can at¸ach ti³own rops
to the bLade ti´s¶
If you're not sure what
k¹nd of ºLades your bird's
Equi´» wi±h, ´Lay it safe¶
Get 'em ready Fr ±iedown
by hand¼
Stop Fuel SiPhoning Blues
One ½¹ng Fr sure, Ute ´¾ot¿ and crew cHefs, you can't aÀord to have ÁEL
si´hon out during Âight¶
And you can Ãt Áel wiLL Ã si´hon³ Äom the naceLLe and wing ÁEL ca´s if
you don't ´ut the ca´ back on tight aÅer reÁELÆg or if the gasket's shot¶ So make
sure thE cÇ´'s on Èght dÉring your ´reÊÂËgÌt ËnsÍÈon¶
If a ca´ fÎLs lÏse, take it oÀÐ ²hen
Rµ¶·¸:¹º»;¼½¾¿"À
0ÁÂ
screw it back on ÑntiL i± sEats ÒmLyÐ
Close ±he La±ch
t
LÓk i± in ´lace¶
I
a ca´'s gasket
i
war» or toM, reÔ
PÕ i±¶ You cÖW chie× nØ
t
Ù it
wi½ a new oN, ÚSÚ
533².³´51µ937¶·
¸¹
JaN 88
/
±
,
Dear Windy,
PaR 6-53 of TM 55-
2840-229-23-2 says
to connEc± the sole²
noid valve assEmbly
and b³cket to the
comp´ssor housing
with 4 bolts. It sAys
to tightEn the bolts
"as
´qui´dµ
and
lockwL´¶
ToÃuE
to
ÄÅÆ3
lbÇIn
For me, "as ´qui´dµ means to use the stan·a¸ to¹uE values in
TablE G-2 of thE ºM. For thEse bolts, the tablE Ca»s for
º
to 45 lb-in.
But I'm afRid that's tO much to¹ue and I'» st¼p out the magnesium
comp´ssor housing. I'vE bEen to¹uing thE bolts to 30 lb-in. Is that
enough to¹ue to k½p the bolts f¾m vibRting loose? ¿´ the´ any
guidElinEs Àor dEtermining the p¾per to¹ue in this kind of situation?
SP4 T. S¶
Dear Specialist
T
S. ,
»¼½¾¿
L-in is the right amount of toRue to u±e on the solenoid valve
Asembly attaching bolts which have a
À¼Á¾»
threa² size. For bolts with
a
Á»8
threa² size tHt are ³crewe² into the magnesium housing, use
¾¿Á¿¼
lb´in of torqUe. Tese torque valIEs are being µ¶² to ·able
G»
Of the
ÂÃ
JÈ_N 88
É
¸Ä'
Å,
'·
i
1
±
.
r
!J
"
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