After Front Module

Inlet/Outlet Disk Valve Seat

and Mounting Post

Front Module Main Body Facepiece Assembly Not Shown For Clarity

External Drink Tube

Drink Coupler

a. Remove outlet valve cover assembly (WP 0025 00) and visually inspect front module main body, communications port, drink tube lever, external drink tube, drink coupler and drink coupler receptacle for damage and/or missing parts.

Front module main body is loose;

communications port, drink tube lever, external drink tube and drink coupler are damaged or missing and/or drink coupler receptacle is damaged.

Report to next higher level of maintenance.

b. Remove outlet disk valve (WP 0029 00) and visually inspect for damage or deterioration.

Outlet disk valve is damaged and/or shows signs of deterioration.

Report to next higher level of maintenance.

c. Inspect valve seat and valve mounting post for damage.

Valve seat is damaged and/or valve mounting post is broken. Report to next higher level of maintenance.

d. Reinstall outlet valve and outlet valve cover assembly.

e. Turn drink tube lever upward to open drink system shut-off valve.

Check drinking system by blowing into internal drink tube. Some resistance should be felt.

There is no resistance when blowing into the internal drink tube.

Drink tube lever is hard to rotate or will not rotate. Report to next higher level of

maintenance.

Table 1. Operator Preventive Maintenance Checks and Services – Continued

PROCEDURE NOT FULLY MISSION CAPABLE IF:

7 After Filter Mounts Left and Right

Filter Mount Not Shown For Clarity

Outside

Inside Self Sealing Disk Valve Seat

and Mounting Post

Inlet/Outlet Disk Valve Seat and Mounting Post

a. Remove M61 filters from filter mounts (WP 0032 00) and visually inspect filter mounts for tight fit and damage.

Filter mounts left or right are loose or damaged. Report to next higher level of maintenance.

b. Visually inspect Serial Number and Lot on filter mount to ensure they are readable.

Not readable. Report to next higher level of maintenance.

c. Visually inspect Bar Code on filter mount for damage.

Bar Code damaged.

Report to next higher level of maintenance.

d. Remove self-sealing disk valves (WP 0031 00) and visually inspect for damage or deterioration.

Self-sealing disk valve is damaged and/or shows signs of

deterioration. Report to next higher level of maintenance.

e. Inspect valve seat and valve mounting post for damage.

Remove air deflectors and inlet valves from filter mounts inside the mask and visually inspect for damage or deterioration. Inspect inlet valve seat and mounting post for damage.

Valve seats are damaged and/or valve mounting posts are broken. Air deflectors are damaged or show signs of deterioration.

Report to next higher level of maintenance.

f. Reinstall inlet valves and air deflectors on filter mounts inside the mask.

g. Reinstall self-sealing disk valves (WP 0031 00) and inspect for proper operation by pressing down firmly on center of valve. Valve disk should pop open and then close when pressure is removed.

Self-sealing disk valve does not operate properly. Report to next higher level of

maintenance.

h. Install M61 filters and check self-sealing disk valves for proper function (WP 0032 00).

Self-sealing disk valves do not function properly.

Report to next higher level of maintenance.

Table 1. Operator Preventive Maintenance Checks and Services – Continued

PROCEDURE NOT FULLY MISSION CAPABLE IF:

a. Visually inspect for filter Lot number and barcode.

Filter Lot number has expired or is not readable. Barcode is missing or damaged Report to next higher level of maintenance.

b. Check that M61 filter seal is present.

M61 filter seal is missing. Report to next higher level of

maintenance.

c. Visually inspect M61 filters for cracks, dents, or holes. Inspect air passages to ensure filter is not clogged with dirt. Inspect locking tabs on both sides of the filter.

M61 filter is cracked, dented, or damaged on a seam and/or filter air passages are clogged with dirt. Locking tabs are missing or damaged. Report to next higher level of maintenance.

d. Visually inspect M61 filters for alignment markings.

Alignment markings are worn or damaged.

Report to next higher level of maintenance.

e. Visually inspect M61 filter mounting lugs and connector surface on filter mount assemblies for damage.

M61 filter mounting lugs are broken or otherwise damaged or filter mount assembly surface is damaged. Report to next higher level of maintenance.

f. Visually inspect M61 filter self-sealing valve actuator for damage.

M61 filter self-sealing valve actuator is damaged. Report to next higher level of maintenance.

g. Shake M61 filters and listen for signs of loose absorbent particles.

Loose particles rattle or dust falls out when filter canister is shaken.

Report to next higher level of maintenance.

Table 1. Operator Preventive Maintenance Checks and Services – Continued

PROCEDURE NOT FULLY MISSION CAPABLE IF:

h. Inspect filter time patch assembly housing and blotter paper alignment within in the window piece. Inspect the time patch blotting paper for blacl and/or blue specs

Time patch assembly color is dark blue.

Housing is missing or damaged. Blotting paper is misaligned within the window piece. Black and/or blue specs can be seen when holding the filter at arms length. Report to next higher level of maintenance.

i. Remove and install M61 filters to check for proper attachment to filter mount (WP 0032 00).

M61 filters do not properly attach to filter mount assemblies.

Report to next higher level of maintenance.

j. Install M61 filters and check self-sealing disk valves for proper function (WP 0032 00).

Self-sealing disk valves do not function properly.

Report to next higher level of maintenance.

9 After Mask Interior

Right Nosecup and Head Harness

Not Shown For Clarity

Check to see that the following components are present:

Internal drink tube.

Nosecup.

Inlet disk valves, left and right.

Vision correction support Frame Stand-off

Any components are missing or damaged.

Report to next higher level of maintenance.

Table 1. Operator Preventive Maintenance Checks and Services – Continued

PROCEDURE NOT FULLY MISSION CAPABLE IF:

10 After Chin Cup and