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Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR MASK,<br />

CHEMICAL-BIOLOGICAL: M45 (con’t)<br />

ITEM<br />

NO.<br />

5<br />

con't<br />

INTERVAL LOCATION PROCEDURE NOT FULLY MISSION<br />

CAPABLE IF:<br />

ITEM TO<br />

CHECK/<br />

SERVICE<br />

Before<br />

Nosecup<br />

Assembly<br />

d. Check that nosecup<br />

valve disks (5) are<br />

present and seated on<br />

nosecup valve seats.<br />

Nosecup valve disks<br />

are missing or not<br />

seated on inside of<br />

nosecup valve seats.<br />

e. Rotate disks to be<br />

sure they are not stuck,<br />

curled, or torn.<br />

Disks are stuck, curled<br />

or torn.<br />

2-8

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