PS Magazine - TB 43-PS-735
PS, The Preventative Maintenance Monthly
ISSUE 735
FEBRUARY 2014
46
PS 735
FEB 14
47
PS 735
FEB 14
Don’t
BATER
the BaTery
Cartridge
Dear Half-Mast,
We do inspections of CBRN rooms for
the National Guard. Our understanding is
that M40/M42 and M50 mask canisters
are good for six months in a non-chemical
environment and 24 hours in a chemical
environment. Is this correct?
SGT
A.G.
Dear Sergeant A.G.,
No, canisters are good for much longer.
If you’re operating where there have been
no chemical attacks and no blood agent CK
(cyanogen chloride) threat, change the canister
annually.
In an area with no conFrmed chemical
attacks but a CK threat in a climate that’s cold
and humid or warm and moderately humid,
change the canister annually. Change it every
39 weeks when it’s hot and dry. Change it every
10 weeks when it’s hot and humid.
±or units that have been hit by chemical
attacks, change the canister every 30 days.
Whenever a Soldier has trouble drawing
breath through the canister, it should be
changed.
±or more information, see ±M 3-11.4,
Multi-
service Tactics, Techniques and Procedures for
NBC Protection.
If you don’t have a copy, go to:
doctrine/Active_FM.html
±or the most current information on
serviceability of canisters and Flters, go to the
Joint Acquisition CBRN Knowledge System
JACKS) website:
Unopened canisters have a 5-year renewable
shelf life.
M50 Time Patch
M50 canisters have the
same standards as those for
the M40. But you should also
pay attention to the time patch
for the M50 canister. If it turns
blue, that signals humidity has
degraded the canister Flter.
Don’t try to insert the cartridge by pushing on it one side at a time. You might
break one of the latches inside the housing. Those latches hold the cartridge in place.
If you break one, Feld maintenance will have to replace the battery housing.
You can no longer order the
dual battery housing, NSN 5855-
01-444-1233.
It’s
a
terminal
item. Instead, order the single
battery housing, NSN 5855-01-
523-4058. The dual and single
housings are interchangeable.
Remove and Insert the Battery Cartridge
To
remove
the battery cartridge, squeeze the tabs on each side of the cartridge and
pull straight out.
While you have the cartridge removed, apply a light coating of lubricant, NSN
9150-01-132-8871, to the O-ring.
To
insert
the battery cartridge, squeeze the tabs on each side of the cartridge. Push
it straight into the housing until you feel the latches click into place.
If you’re having trouble removing or
inserting the cartridge, it might be damaged.
Send it to Feld maintenance.
One other piece of advice: The battery
cartridge is small. It often gets lost or
misplaced. So, when the cartridge is removed,
stow it someplace where it’s easy to Fnd.
Order
AN/PVS-14
with single
battery
housing
If cartridge
is damaged,
send it to field
maintenance
M40/M42-Series, M50 Masks…
How
L
o
n
g
Are Canisters Good For?
AN/PVS-14…
M50 time
patch turns
blue
when
humidity
has
degraded
filter
private
broOtish has
something he
wants to share
with you…
thanks,
ma’Am.
if you have an AN/PVS-14 monocular
night vision device (MNVD) with a
dual
battery housing,
take care
when you
insert the battery cartridge,
NSN 6160-01-444-1208.
Forcing the
cartridge into
place could
damage
the
housing.
Don’t
BATER
the BaTery
Cartridge
735 46-47.indd
1-2
12/31/13
11:15 AM
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