Protect Yourself From
Chemical/Biological Contamination
Using Your Assigned Protective Mask
TASK # 031-503-1035 Skill Level 1
REFERENCES
Required
FM 3-3
FM 3-4
STP 21-1-SMCT
TM 3-4240-279-10
TM 3-4240-280-10
Related
TM 4240-300-10-2
Task
Protect Yourself From Chemical/Biological
Contamination Using Your Assigned Protective
Mask
Conditions
Given your assigned protective mask with hood and carrier, a
canteen with an M1 canteen cap, an M291 skin decontamination
kit, an M295 decontamination kit, M8 detector paper, and
applicable technical manuals (TMs). You find yourself in one of
the following situations:
1. You hear or see a chemical or biological (CB) attack.
2. You realize, through other means, that you are under a CB
attack.
3. You are ordered to mask.
4. You must enter a contaminated area.
After having donned your protective mask, you need to drink from
your canteen.
Standards
Don, clear, and check your mask within 9 seconds.
Drink water through your protective mask from your
canteen without becoming a casualty.
Don the Mask
a.
b.
c.
d.
e.
f.
g.
h.
Stop breathing and close your eyes
Remove your helmet
Take off glasses (if applicable)
Open the mask carrier with one hand
Grasp the mask assembly with other hand, remove it from
carrier
Put your chin in the chin pocket and press the facepiece
snugly against your face
Grasp the tab and pull the head harness over your head
Use one hand to tighten the cheek straps
Clear the Mask
a.
b.
Seal the outlet valve by pushing it on the center of the outlet
valve cover with one hand
Blow out hard to ensure that any contaminated air is forced
out around the edges of the facepiece
Check the mask
a.
b.
Cover the inlet port of the filter canister (M40- and M45series) or the inlet port of the armor quick disconnect (M42series) with the palm of your hand and breathe in
Ensure that the facepiece collapses against your face and
remains so while you hold your breath
9 Seconds
The mask must be donned, cleared and checked within 9 seconds
Last Steps
Next, you will:
a.
b.
c.
d.
e.
Resume breathing
Secure the mask hood
Drink water while wearing the mask
Remove and store the mask
Perform all steps in sequence without becoming a
casualty