1. M40 Series Protective Mask Outlet Valve Outlet Valve Seat
PMCS Check List
Side Voicemitter
loose lock ring
missing gasket
reversed voicemitter
(four bee bees faced outward)
Lens
broken
cracked
scratched
discolored
Drink Tube
Quick Disconnect
clogging
leaking
(see manual)
Canister and Port
damaged canister
loose canister
inlet valve body improperly installed/missing
Outlet Valve Outlet Valve Seat
damaged
dirty
missing
corroded
damaged
dirty
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Internal Drink Tube
coupling sheared off
drinking tube missing
Front Voicemitter
loose retainer 1 2
SMCT Warrior Skills Level 2-4 STP 21-1 (Sep 08)
STP 21-1 (Dec 06)
SMCT Warrior Skills Level 1
FM (Apr 06)
CBRN Decontamination:
FM (Jun 03)
CBRN Protection:
Field Manuals
TM &P (Nov 99))
M41 PATS
TM & (Aug 10)
M40A1/M42A2
TM (Feb 94)
M42A1:
TM (Aug 98)
M40A1/M40A2:
Operator’s Manuals
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References

2. Test / Fitting For Your Pro Mask
For clarity, the operator may elect to explain the next test to the individual just before
the Soldier must accomplish it (i.e., during exercise one explain that exercise
two requires deep breathing (in through the nose and out through the mouth)).
Exercise 1: Normal breathing, keeping the head motionless.
Exercise 2: Deep breathing, slowly but deeply inhaling through nose and exhaling
from mouth.
Exercise 3: Head movement side to side, looking over each shoulder in one-second
intervals. Ensure the canister does not touch shoulders while performing this exercise.
Exercise 4: Ensure the canister does not touch chin while performing this exercise.
Head movement up and down, looking at ceiling then floor in one-second intervals.
Exercise 5: Rotate chin, moving the jaw in a circular pattern with mouth slightly
open.
NOTE
After the fifth exercise, you will hear a series of three beeps. An overall test result will then be displayed.
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M41 PATS 99.5% Pure Reagent Grade Isopropyl Alcohol: NSN 4
Never store a mask wet; air dry
Ensure lens are facing outward
Store It Right To Prevent Damage
Left-handed Storage
Right-handed Storage
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3. Will Cause Facepiece Cuts Folding The Mask In The Carrier
Outlet Valve Will Leak If Not Clean
Outlet Valve Body
Remove any dirt.
Outlet valve body sealing surface should be smooth; feel for irregularities with fingernail.
Mask is unserviceable if damaged.
Outlet Valve Disc
Remove any foreign objects from disc (i.e. dirt, sand, or hair).
Replace disc if damaged.
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You Break It!
You Fold It…
Mask is unserviceable if cuts or holes exist.
Caused by improper storage in the carrier.
Most commonly found inside the facepiece next to the internal drink tube.
Inspect facepiece for cuts or holes.
Will Cause Facepiece Cuts
Folding The Mask In The Carrier

4. Your Mask Won’t Seal With
A Bad Head Harness
Replace the head harness under the following conditions:
When it does not hold the mask
assembly firmly against your face.
When it is cut, torn, or frayed.
When it has missing buckles or tabs.
When it is deteriorated or stretched out.
(NSN: , part )
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If Rubber Is Torn...The Mask Is Unserviceable! 7 8
Make Sure These Items Are Tight
Front Voicemitter
Side Voicemitter
Ring To Tighten)
(Use the Carrier’s “D”
(Turn Clockwise- if it is loose, the mask is unserviceable)
Check Tightness by Hand.
Canister
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(Hand Tight)

5. DO DON’T Perform maintenance according to technical manuals.
Use waterproof bag when required
Clean according to manuals
Use your outserts.
Keep your mask clean.
Ensure your second skin is attached.
Replace worn out parts.
Keep drinking system clear- ONLY
DRINK WATER.
Fitted with M41 PATS.
Reference the TM every time.
Make sure you never store food in
your mask carrier.
Use as a pillow.
Only perform 10 Level maintenance.
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PAST 10 LEVEL.
DO NOT PREFORM MAINTENANCE
Dent the canister.
parts are wet.
Store your mask when any of its
Fold mask.
unless necessary.
Remove side voicemitter assembly
Sit or lay on the mask/carrier.
DON’T
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