TM 3-4240-334-20&P

TM 3-4240-334-20&P
2-13. MASK ASSEMBLY ADJUSTMENT, INSPECTION, AND REPAIR.
This task covers:
a. Facepiece Hood Repair h.
b. Eye Lens Cushion Replacement
c. Internal Drink Tube Replacement i.
d. Outlet Valve Disk Replacement j.
e. Outlet Valve Cover Replacement k.
f. Voicemitter Replacement l.
g. Linear Microphone and Microphone
Adapter Replacement (Type I Mask)
Dynamic Microphone and Microphone Adapter
Replacement (Type II Mask)
Setscrew Adjustment and Replacement
Canister Inspection and Replacement
Flat Washer Replacement
Mask Carrier Strap Replacement
a. Facepiece Hood Repair.
INITIAL SETUP
Materials/Parts
Maintenance Kit, Toxicological Agent
Protective Clothing (Item 17, App D)
Cloth (Item 8, App D)
Equipment Condition
Canister disconnect detached from blower
NOTE
Hood repair procedures include the following restrictions.
1. Do not attempt to repair facepiece hood if it is separated from faceblank. Replace facepiece assembly.
2. Do not apply more than three patches per hood.
3. Do not overlap patches.
4. Do not repair hood if:
REPAIR
2-48
(a) Tears are longer than 1 inch
(b) Holes are larger than 1 inch in diameter
(c) Tears or holes are less than 2 inches apart
(d) Tears or holes are on strapped seams
(e) Tears or holes are within 2 inches of faceblank
CAUTION
When performing maintenance on the mask, do not scratch the plastic lenses.
Keep work area clean. Dirt in or on items could prevent airtight integrity.
1. Locate chafed, torn, or punctured area on hood.
2. Clean and dry damaged area with dry cloth.
3. Buff area lightly but thoroughly with abrasive strip (1).