PS Magazine - NOVEMBER 1979
PS, The Preventative Maintenance Monthly
ISSUE 324
NOVEMBER 1979
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Protective Masks .±.
Dry
rot's
a
knowN
hazard
to
protective masks like the ML 7 /17 AL,
M24 or M25/25A±, No matter wHere
i
you are.
But, throw iN a lot of heat, humidity
aNd heavy raiN, aNd t²e chaNces of dry
'
.:'·±²
"·
rot take a giaNt step upward .
.. whet²er
_,-
-
,
you Use the mask oN the groUNd, IN
-±"
,².³
³
-r
1 ·p
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aircraft or iN armor.
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!³´
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1R•
About the oNly t²iNg you caN do is
±
´
fFC H
itMJ\ lµ Gh L¶"j
I
look for it. YoU caN't repair dry rot,
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aNd you caN't take a chaNce wIth It aNd
³
\
¸e
¹IE
a
sdº»r
nam¼D ½¾R¿AÀÁ
use your mask.
µ¶·¸
 Wo
cm O
ÃÄkÅ gÆÇÈÉÊË SÌTÍNÎÏ
So, slightly stretch the faceblaNk
¹º»
i
ÐuÑ ÒÓÔ ÕÖ×K ØÙ Ú1Ûc ÜOÝ
´
.
´,
µ
Þßpà áâ ãäåæçèé
¶¸
/
StRetch 1t.
..
µ'
ê
ë
ìíî
you C1
ïðñòó
µ:
\
'¶
·
aNd
search
the
rUbber for ³ry-rot
cracks (they usUally s²ow up as 2 or
more fiNe cracks close toget²er). ´f yoU
fiNd
AnY
sigN of dry rot, tUrN IN t²e
mask.
48
,¼
½¾
¿ÀÁÂÃ
'¹
Just remember, doN't attempt to
repair a dryµrot crack. ´t could be the
la¶t rePair you'd make.
´f you're iN charge of t²e ·BC room
aNd you¸re IN a hot, humid area, air
co¹dItioNiNg aNd dehumidifiers ²elp
ºreveNt dRy rot. ONe or both of those
Items are worth the moNey If you caN
get 'em authorized.
Other mask parts you shoUld check
more ofteN IN hUmi» areas are the
i¹let aNd Nosec¼p valve disks. They
Inlet and
nosecup valve
disks OK?
Stick? Dry and
sprinkle with
taLcUm!
deterIorate fast. AN improved dIsk for
all clImates may get to t½e fIeld sooN.
MeaNtIme, check as ofteN as weat²er
coNditioNs demaNd. A ¾M¿S every
6
moNths might Not ²ack it. The disks
could be uNserviceable. ÀIke the maN
¶ays, yoU check to see If the disks are
curled, brIttle or »Iscolored.
FIlter elemeNts Need extra checkiNg
CHeck
e²Ements
often
You ca¹ make a quick check wIthoUt
removINg t²em from your mask.
SquEezE
ligHtly .
. .
¸¹º
ôõö÷
li³e so .
. .
Áold the mask as s²owN. SqUeeze
lig²tÂy (Not mUch pressure ¹ee»ed),
aNd If the filters mash toget²er, feel
mushy or are hard to breathe throUgh,
get
them replaced. ´f they¸re firm
they're OK.
iN hUmid weather, too. They get
ÃUshy, aNd wheN they do, they should
be
rePlaced.
·ew
oNes
may
g
±
u¹serviceable IN
6
moNths or less
Ä
±²³
!-
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