PS Magazine - JUNE 1984
PS, The Preventative Maintenance Monthly
ISSUE 379
JUNE 1984
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CH-47 .±.
Don't Be a Sharpy!
Corroded
Chinook
flight
control
system bellcranks can cause the bird's
controls to bind-or Fil-in midair.
Your CH± 7 has lots of bellcranks in its flight control
system. SomE are more exposed to the elements than
others.
,
²yeball them all ³r a scaly, blistereD appearance. The
paint will be discolored, usually with deposits of gray or
white powder.
No corrosion is allowed. If you spot
it, the bellcrank has to be cleaned and
´reated. You may be able to do the job
without removing the part.
But µever use kn¶ves, screwdrivers
oR other sharp tools to check bellcra·ks
fOr corrosion. You
±ii
scratch the part
and remove the protective finish. The
result is more corrosion.
Treat corrosion, scratches, gouges
and other minor damage according to
Para 11¸1¹9 in TM 55º¹520»227¸23¸4.
´µ
1±²³´µ¶·¸¹º»¼½¾
-²
If
your unit has not received a
message In which you have an
interest, check with your next
higher headquarters.
OV-1-84-02
SOF
Technical,
OV-1B series± inspection of for²
ward and aft SLAR attachment fit³
tIng. ´7´745Z Feb 84µ
U±21-84±01
SOF
¶echnica· ±
U¸21NG and RU¹210/H serIes± Inº
spection
of
aft¸facing
seatsµ
2716»»Z Feb
8¼µ
Gen½1¾84¿»1
SOF
Maintenance
Mandatory±
Àight visIon gogg·esÁ AÀ/PVS¿5Aµ
»7´4»»Z Feb 8¼µ
MTM²AH-1³MEM±84·03
AH¸1S
(ECAS±
PROD±
MC)
engIne
38
presÂure torque tranÂducer ÃÄteÅ
replacement procedures± 1»133»z
FeÆ 84Ç
M´µ±CH±5¶±8¶±MEM²01
CHÈ
5¼ÉB ·andIng gear struts 161415z
FeÆ 8¼Ç
M´M±U¸21±84±MEM¹º1
U2´A
vo·tage regu·atorµ »Ê141Ëz FeÆ
8¼Ç
JUN ¶
Uh²1 Series ³´µ
TRiggeR switche³ NSN
-·
Use NSN 1680¼0¹¸043¸8759 to get a replacement intercom trigger switch
½r your Huey's cyclic stick. It's shown as Item 12¾ ¿ig 353 in TM 55¸1520À 2¹0Á
23PÂ2. The NSN doesn't show up on the AMÿ, so use a Ãà ¿orm ¹348¸6Ä Note
Kiowa ³´¶
in the Åemarks block that the NSN is
not on the AMÿ.
The ÅIC (Åouting IdentiÆer Code)
for this $7. 76 item is ¿PZ. Use the
highest priority you can justify.
Ãon't try to replace your triggeR with
NSN 5930Ç00À¹76¸0¹93 (part of cyclic
stick, Item 26È ¿ig 352)É The two items
aRen't interchangeable.
It takes a little extra eÊort to oRder
the right tRigger. But it's a heap cheaper
than replacing the entire grip assembly
control at $348 a whack!
Cowling Latch
PM
Ëpening the ËH¸58 latches the right way can stop maintenance downtime and
parts replacement. Could keep you from getting a steelÌpunctured thumb, too!
I
i I
If you pop open the engine cowling
u·E bOt¸ T¹ºmb
¸¹º=
side panel latches with a tool or your
And fIngER TO OpEn
thumb, you
±ii
damage the bird when the
lAtc¹
springÌloaded latch hits the Íowling
skin or the cotter pin breaks the latch
spRing. Next time
Î
you open the cowlÏ
ing, you could get a Ðhumb Ñll of steel
spring.
Adding a doubler to reinfOrce the
panel is expensive and timeÌconsuming.
So, open the latches with both thumb
and finger to stop the spring»loaded
latch Òom stRiking the skin haRd or the
pin from breaking the spring.
JUN »4
39
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