PS Magazine - TB 43-PS-724

PS, The Preventative Maintenance Monthly

ISSUE 724

MARCH 2013
PS Magazine - TB 43-PS-724 - Page 12 of 33
21
PS 724
MAR 13
A
rmament, electrical and avionics repairers, the Kiowa Warrior aft avionics door
chain has caused problems for the common missile warning system (CMWS) and in
some cases the aircraft itself.
While the aircraft is in Fight, the door chain can accidently contact exposed CMWS
circuit breaker wire connections behind the CMWS panel. When that happens, it
causes electrical shorts that burn out the CMWS wiring.
As a temporary ±x, some repairmen have
resorted to applying heat shrink tubing to the chain
to prevent metal-to-metal contact with the circuit
breaker wiring. That’s not needed anymore.
So here’s the solution. Instead of applying heat shrink tubing to the chain, follow
the instructions in TB 1-1520-248-20-86,
Temporary Application of Polyurethane
Removable Sealant to CMWS Circuit Breaker Wire Connections for All OH-58D
Aircraft.
The ±x involves appling polyurethane removable sealant, NSN 8030-01-
577-8134, to the exposed CMWS circuit breaker wire connections using a dispenser,
NSN 5120-01-494-7678. Applying sealant to the circuit breaker wire connections
prevents shorts from the door chain.
TB 1-1520-248-20-86 gives you all
the materials and detailed instructions
to prep your aircraft before applying
the sealant. ²or your safety, make
sure you pay close attention to the
warnings, cautions and notes.
Make a note that this ±x will be
added to an upcoming revision to
MWO
1-1520-248-50-24,
ModiFc-
ation Instructions for the Installation
of Common Missile Warning System
(CMWS).
OH-58D…
Fixing the Door Chain Problem
UH-60M/CH-47F…
Return improved Signal Data Converters
Connections are behind CMWS circuit breaker panel
Metal chain can cause electrical
short upon contact with exposed
circuit breaker connections
Apply polyurethane to circuit breaker
connections to prevent shorts
Mechanics, the CECOM
headshed has a
limited
supply
of serviceable
improved signal data
converters, NSN
5895-01-5
77
-5425 (PN
MB503A-00).
To help them out,
return
all
unservice-
able improved signal
data converters
through normal
supply channels to
CECOM for repair.
if you have questions,
contact the item
manager, Danielle
Zambrano, at (443) 395-
1426 or email:
danielle.l.zambrano.civ@
mail.mil
Improved signal data converter
looks like the
missile system is
acting
screwy!
I think the
chain shorted
out the missile
system
again!
Look what I found
in
PS Magazine!
well, we
don’t have
to worry
about that
anymore.
All we have
to do is
apply some
polyurethane
to the CMWS
connections
and we’re
back in
business!
724 20-21.indd
1-2
1/21/13
2:58 PM
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