PS Magazine - JANUARY 1982
PS, The Preventative Maintenance Monthly
ISSUE 350
JANUARY 1982
l=±²aiL
Boom
(Right §iJe Cnt.
=
When you inspect the main rotor
blades, a rattLe in the bLade tip is
normaL. The noise is caused by
movement of the tip weights.
Rattle in
blade
tIp is
normaL
When the screws oR weights at the
inboaRd part of tHe bLade aRe loose,
tho, you have a diffeReNt situation. The
screws are bonded in place during
manufacture. You'Re not alLowed to
ti
g
hten them, so PaRa 5-86g iN the
maintenance pub says the bLade has
to be repLaced.
If youR aircraft has tHe tai± boom
that has not been modified to use Nuts
and bo±ts fOR attachment of the veR²
tica± fin, onLy bo±ts and nut p±ates Ho±d
that baby. Tw³ foRward (±ong) bo±ts
´aNd 2 aft (shoRt) bo±ts aRe used.
an additional thin washEr next to the
recess washer.
'Course, the antenna connectionS on
the verticaL fin aLso have to be tight.
If the taiL skid is exµremeLy Lo³se,
the bird may have had a hard Landing.
Give the taiL boom tHe once¶³veR for
skin wrinkLing, wHich might indicate
structuraL damage.
When you check the taiL-rotor gear
box, moistuRe in tHe sight gLass·due
to condensation¸is
OK.
If the oiL has
a "miLky¹ appearance, tho, caLL foR a
Tº
»
By the way, if the gear¶box fiLLer¼cap
spring doesn't give you a snug fit,
spread it. If the spRing is sprung, tho,
cHange it.
'Course, tHe geaR box is magnesium
whiLe the taiL boom is a±uminum. You
½ave a Look¾see at tHe ±oweR aft bolt
know hat happeNs when dissimiLaR
because it could bottom out on the metaLs meet¿coRRosion!
Ào you
balLast weigHt, meaNing the VerticaL shouLd spot a strip of protective tape
fin is not secUre. If tHat's the case, add betweeN the two.
44
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·±
lL
.± _
JÁÂ
ÃÄ
ÅÆÇ;o È
u ÉÊË don't want meta
±
to-meta con-Ì
Í
tact beÎween the taiL-rotor pitch horn
and yoke, either. Take the celLophane
from a pack of butts and inseRt oNe
thickness between the 2 parts as youR
buddy gives you fulL ±eft pedaL. If the
0.001-in
ceLLophane
won't move
freely, you don't have the 0.001Ï0.012-
in required cLearance .
When you Look at the tai±-rotoR
bLades, be suRe yoU have the correct
boLtÐ at the outboard blades attacHÑ
ment points. The Caution in PaRa
5-
188d of TM 55-1520-228-23 says onLy
ÒAÀ 1306-31 thrÓ -36 bolts aRe
authorized. The ÒAÀ 676 titanium
boLts originaLLy used won't hoLd up
with the curRent seLfÏLockiNg
nuts .
.. the boLt thReads go to pot!
Inspect the blades for cracks.
Ôive the Left side of the taiL boom
the same eagle-eye tReatment you used
on the right side ³f your bird. Working
rivets aNd chipped paiNt might not
keep your biRd on the ground but they
should be writteN up for coÕrRection
during scHeduLed maintenance.
45
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