PS Magazine - TB 43-PS-719
PS, The Preventative Maintenance Monthly
ISSUE 719
OCTOBER 2012
42
PS 719
OCT 12
Dear Half-Mast,
On Page 59 in PS 712
(March 12), you said to use
only isopropyl alcohol to
clean inside the Sentinel’s
compartments. Rubbing alcohol
shouldn’t be used because it
removes the protective coating
on the compartments’ walls,
which leads to corrosion and
arcing. What I find confusing is
that rubbing alcohol is mostly
isopropyl. Please clarify this.
SFC James Bishop
CAARNG
Stockton, CA
Dear Sergeant Bishop,
We are always glad to clarify.
Rubbing alcohol does indeed contain
70 percent isopropyl. It’s the acetone that
makes up the other 30 percent that causes
the problem. Acetone is what strips off the
protective coating.
TM 9-1430-Sentinel (1 Apr 2010) says
to use technical isopropyl alcohol, NSN
6810-00-753-4993, for cleaning because
it’s 70 percent isopropyl and 30 percent
water. No acetone,
no problem.
Dear Editor,
I noticed in the M40/M42 mask’s
TM 3-4240-346-23&P (Aug 10),
the nosecup valve disk and the nosecup
valve seat assembly are reversed in both
Fig 2 and Fig 4 of WP 0031. The valve
seat assembly is actually Item 2 in both
figures and the valve disk is Item 3. I’ve
submitted a DA Form 2028, but CBRN
specialists might want to correct their
TMs in the meantime.
MSG Andrew Wilde
MOARNG
Jefferson City, MO
Editor’s note:
Good eye, Master Sergeant. CBRN specialists,
make a note of this correction to save yourself parts confusion.
But sometimes a drain hose plugs up and the condensation backs up. The
easiest fix is to suck on the end of the hose to clear it, which of course
isn’t very sanitary. So instead, disconnect the drain hose and blow it out
with an air hose.
CW2 Michael Smith
SGT Joshua Rogers
SPC Nicholas Griffin
2/43 ADA
Ft Bliss, TX
Editor’s note:
You’ve just made
things much cooler for the ECS
with your cool suggestions.
correct
Sentinel Radar System…
What
Is the
correct
cleaning
Alcohol?
M40/M42-Series Masks…
Nosecup
Parts
Reversed
Reversed
uh-oH!
They made
a
mistake
on
my nosecup
parts.
I Gotta
get this
straightened
out!
Here’s the
rubbing alcohol!
I’ll have you
cleaned up in a
jiff!
Whoa, Soldier!
Keep that
rotgut away
from me! it’ll
peel off my
finish.
isopropyl
alcohol
is what I
need!
Nosecup valve seat
assembly is Item 2.
Valve disk is Item 3
M1135 NBCRV Stryker…
Opening BAWS Manually
if there is a
failed electronic
actuator
while operating the
NBC reconnaissance vehicle
(NBCRV), you
must manually
open
the biological agent
warning sensor (BAWS) intake
closure assembly (ICA).
Unfortunately,
the NBCRV’s TM
doesn’t
explain
how. Turn the
page to find
out!
Valve seat
assembly (2)
Valve disk (3)
719 42-43.indd
1-2
9/4/12
2:41 PM
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