PS Magazine - TB 43-PS-711

PS, The Preventative Maintenance Monthly

ISSUE 711

FEBRUARY 2012
PS Magazine - TB 43-PS-711 - Page 24 of 33
44
PS 711
FEB 12
45
PS 711
FEB 12
Dear Editor,
There are a few points that need clarifying in your M40/M42 article,
“Beware of Loose Nosecup,” on Page 41 of PS 705 (Aug 11) to keep from
confusing Soldiers:
±
The first and third paragraphs confuse the front voicemitter with the
outlet valve. The first paragraph should read
“…I often run into M40/
M42 masks in which the nosecup has pulled away from the
back of
the outlet valve housing.”
And the third paragraph should say
“When a Soldier clears his mask
or exhales, all of the air is supposed to be blown out through
the
outlet valve body.
If the nosecup is unseated from the
outlet
valve housing,
you could have trouble with the mask fogging up.”
The nosecup is bonded and sealed to the front voicemitter housing and
then attached to the outlet valve body. If the nosecup isn’t attached to the
outlet valve body, all the air won’t be blown out of the mask when the Soldier
exhales. This is explained in WP 0003-1 in TM 3-4240-346-10.
But just because the nosecup is not
assembled correctly doesn’t mean the
mask won’t seal. You can blow out any
contaminated air by pressing in on the
center of the outlet valve cover while
blowing out hard. You shouldn’t breathe in
at all until you’ve cleared your mask like
this, which is a good thing to practice
in the CS chamber during training. Even
if the nosecup is not seated correctly,
incoming air will still have to pass through
the filters, which makes it OK to breathe.
But you could have trouble with the eye-
lenses fogging or moisture building up in
the nosecup.
Joseph Maheady
APG, MD
Editor’s note:
Thanks for the clariFcation, Joe. Soldiers, remember to check for
a loose nosecup while you do your normal PMCS and function checks. The PMCS
is listed in WP 0005-10 and the function checks in WP 0005-14 in the -10 TM.
The NSN includes the strap and four each
of the attachment tabs, mounting screws and
posts. The strap comes in a one-size-Fts-all
foliage green.
NSN 8470-01-531-3351 gets the strap
alone without hardware.
Need to order the individual hardware—
attachment tabs, mounting screws and
posts—for the strap? ±ED LOG gives
these items an acquisition advice code of
V, terminal item. That means the items are
available, but only until the current stock is
exhausted. Here are the hardware NSNs:
W
ithout a chin strap, your advanced combat helmet (ACH) will soon tumble off
your head. Get a four-point chin strap with NSN 8470-01-530-0868.
Item
NSN 8470-01-
Mounting screw set.
Includes four each of
attachment tabs,
posts and screws.
Attachment tabs (box of 50)
Mounting screw (box of 50)
Post (box of 50)
533-1011
531-3897
531-4268
531-4284
M40/M42-Series Mask…
Loose
Nosecup
Part 2
Advanced Combat Helmet…
Kep It
on
Your HEad!
NSN 8470-01-530-0868 brings
strap
and
hardware
Tabs, screws
and posts are
available until
stock is gone
here are a few
more things to
remember when
checking the
nosecup on your
m40/m42 mask!
if contaminated air is
in your mask, push in on
the center of the outlet
cover and blow out hard!
711 44-45.indd
1-2
12/22/11
11:23 AM
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