PS Magazine - TB 43-PS-614
PS, The Preventative Maintenance Monthly
ISSUE 614
JANUARY 2004
T
he M42A2 chemical/biological mask uses a dynamic microphone, NSN 5965-
01-414-2257. When wearing a CVC helmet and plugging into the AN/VIS-3 com-
munications system, one end of the microphone cord plugs into the front voicemit-
ter socket of your mask. But some folks aren’t sure where the other end goes.
Here’s where the confusion comes
in. The microphone cord plug, JJ-055,
has two sockets. But the receptacle in
the CVC helmet has three pins!
Here’s the scoop: Use that recepta-
cle to plug in the microphone cord,
but only use the first two pins. The
third pin provides DC power to elec-
trical microphones, which your mask
mike isn’t. Your microphone is
dynamic, which means it requires no
electrical power.
So—plug it in and don’t worry
about the third pin!
PS 614
JAN 04
41
M42A2 Mask Microphone…
PS 614
JAN 04
40
AH-64A/D…
S
tanding water inside the canopy jettison handle access door (T50) of your Apache
means you need a rotor rooter job, repairers.
The canopy jettison handle sits forward of the copilot gunner window (CPG)
under a quick release panel for the ground crew to blow off the side panels in an
emergency evacuation.
Just because it’s out of sight doesn’t mean you should put it out of mind. If you
do, and water backs up into the canopy housing because of a clogged drain hole, you
can bet your bottom dollar that the canopy jettison system will short out. Plus, water
can also seep into the forward avionics bay and cause damage to components.
So when you perform your 10-hour/14-day inspection like it says in TM 1-1520-
238-PMS, eyeball the drain hole inside the canopy jettison pin stowage area to make
sure it’s not filled with water.
To unclog the drain hole, use a 6-ft, long,
1/16-in diameter wire. Attach a “Remove
Before Flight” streamer, NSN 8345-00-
673-9992, and swedge, NSN 4030-00-960-
1654. Smooth out all the burrs with a piece
of crocus cloth and lightly coat the wire tip
with RTV and let dry. Snake the drain hole
with the wire to get the crud out. When the
drain is clear, remove the wire to prevent a
FOD problem.
Use wire to unclog drain hole
Plug has
two sockets
why
are you
crying?
I’m
not
crying!
I think water has
backed up in my
jettison pin
storage area!
don’t
worry!
this
wire will
root out
the crud!
WHERE
DO YOU
PLUG
iT iN?
614. 40-41 (C)
11/28/03
1:45 PM
Page 1
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