TM 9-4310-394-13
2-4. PMCS PROCEDURES. - Continued.
(5) Hoses. Look for wear, damage, or leaks and make sure clamps and fittings are tight. Wet spots show
obvious leaks, but a stain around a fitting or connector can also mean a leak. If a leak comes from a loose fitting or
connector, tighten it. If something is broken or worn out, report it to your supervisor.
j.
When you check for "proper operating condition", you look at the component to see if its serviceable.
2-5. SPECIAL INSTRUCTIONS. If the equipment must be kept in continuous operation, check and service only those
items that can be checked and serviced without disturbing operation. Make the complete checks and services when the
equipment can be shut down.
2-6. LEAKAGE DEFINITIONS FOR OPERATOR PMCS. It is necessary for you to know how fluid leakage affects the
status of the air compressor unit. Following are types and classes of leakage an operator needs to know to be able to
determine the status of the air compressor unit. Learn these leakage definitions and remember -- when in doubt, notify
your supervisor.
CAUTION
Equipment operation is allowable with minor leakages (Class I or II). Of course, consideration must be
given to fluid capacity in the item/system being checked/inspected. When in doubt, notify your supervisor.
When operating with Class I or II leaks, continue to check fluid levels as required by your PMCS.
Class III leaks should be reported immediately to you supervisor.
a. CLASS I Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
b. CLASS II. Leakage of fluid great enough to form drops, but not enough to cause drops to drip from item being
checked/inspected.
c. CLASS III. Leakage of fluid great enough to form drops that fall from item being checked/inspected.
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