PS Magazine - NOVEMBER 1985
PS, The Preventative Maintenance Monthly
ISSUE 396
NOVEMBER 1985
, I
/
Dear Editor,
We don't have a micrometer to measure bolt-hole wear in the
tailboom attachment fittings of our Cobras. Micrometers aren't
included in our
A
VUM tool kits, so we always had to scrounge
one from suppoR±when we could.
Then we Got
A
VIM to make us a simple ²O±NO ²9 tool to
measure bolt holes. It's made Fo³ solid 31-inch diAmeter
aluminum stock 3 to 4 inches long and coated with Alodine
chemical ´Lm, NSN 8030-00-057-2354, to make it coµosion
resistant.
'
·
_
I
0
.±²
3-4"
l
T
Solid aluminum stock
J
)
T
One end of the stock is machined to 0.506-in diameter±the
same diameter of the bolts. The other end is machined to
0.5¶6-inch±the maximum diameter permitted fo· the b¸lt hol¹s.
To use the gage, we put the smAller end into the bolt holeº If
it's
not
sloppy, the hole's OK. If it
i±
sloppy, we tu» the tool
around And t¼ th¹ big end. If it ½its, too, the structural panels hAve
to be repaired or replaced.
SS² Jeµy Tr
a
ino
¾t Bragg, NC
AH²1³ {PrOD) .
..
Cobra "CreEpeR± Culp²it
If your Cobra's colle±tive ²ontrol sti±k is a "±reeper,³ it may be ±aused by
a woR bolt on your bird´s ±olle±tive servo ±ylinder.
Take out the bolt, Item
22
in Fig
7-16
of TM
55³´520µ236µ23¶2·
µf you ¶nd
grooves woR
·
into the bolt shank,
repla±e the bolt with
NSN 5306¸0¹µ
638¶5777·
I Gºls
´INKIµG
F!L»i¼ r ½¾
M¶
¿OMaCÀÁÂ
mÃYU Ä
,HÅÆ ReÇ
!
When you reassemble the bolt and
springs, make sure the smaller wire
spring goes on top of the larger spring,
like it says in Para
7È65·
-
RepLace wo·n bol¸ wiTh
¹S¹ 5º06»00¼638-5777
Smalle·
w½·e
¾
sp¿ing
Àa·ge¿
sp¿½ng
CAT 1 EIR Phone:
±
fwoFD®i ²@gG³´µ
ÉÊ
AUT
³
o
±²
:
·2066
¶
If your unit has not rece±ved a
message You Have an ²nterest ²n,
check with your next higher
headquarters.
U·8·85³04´
SOF, TecHnical, U-8
One±t²me and recurring ²nspect²on
of engine
mo³nt²ng structure,
´72300Z JuL 85.
U-8µ85µ05
and
Uµ21µ85µ02´
SOF,
µechnicaL, One·time and rec³rr²ng
²nspection of U¶8, U¸21 and RU¸2´
se¹ies nose ºanding
»
gear struts,
´22230Z Jul 85.
O¶-58¸85¹02´
SOF, Ma²ntenance
Mandatory, One¼t²me ²nspection for
ËÌV ÍÎ
right hand cycL²c controL stick
cracks, 232200Z JuL ½5¾
A¶µ64µ8º5µ03´
SOF, Techn²caL,
A¿À64A, OneÁtiÂe ²nspect²on of
dr²ve sHaft coupL²ngs for proper
assembly, 182200Z Juº 85Ã
U¶µS»Aµ85µ21´
SOF, Maintenance
Mandatory, Ma²n rotor sp²ndle and
t²e rod retirement life change,
08´600Z juL 85Ã
U¶µ60Aµ85µ22´
SOF, Operational,
Uĸ60A/Eı60A flight restrict²ons
w²th eng²ne sequence valve
assembL²es/pressuriz²ng
and
Ï9
overspeed
un²t
assembLies,
112110Z Jul 85Ã
U¶¹60A¼85³23´
SOF, µechnical,
One¶t²me ²nspection, ta²l rotor dr²ve
sHaft bearings, 252320 JuL 85Ã
A¶µ1µ85-04´
SÅF, Ma²ntenance
Mandatory, One¸t²me and rec³rring
²nspect²on of aLl K747 main rotor
bLade erosion guards ²nstaLled on
some AÄÁ´ S (all ModeLs), 222359Z
JuL 85Æ
MIM½O¶¾58µMEMµ85¼01´
Oĸ
58A/C Ma²n rotor Hub p²LLow block
mounting Hardware, 03´430Z Jul
¿À
I
Á
'´µ.
•Ð
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