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TM 10-4930-229-12&P
c. Fluid Lines. Look for wear, damage, and leaks. Make sure clamps and fittings are tight. Wet spots and
stains around a fitting or connector can mean a leak. If a leak comes from a loose connector, tighten it. If
something is broken or worn out, report it to unit maintenance.
d. Leakage Definitions. It is necessary for you to know how fluid leakage affects the status of your equipment.
The following are definitions of the types/classes of leakage you need to know to be able to determine the status
of your equipment. Learn and be familiar with them. When in doubt, NOTIFY YOUR SUPERVISOR.
CAUTION
Equipment operation is allowable with minor leakage (Class I or II) of any fluid except
fuel. Of course, consideration must be given to the fluid capacity in the item being
checked/inspected. When in doubt, notify your supervisor.
When operating with Class I or II leaks, continue to check fluid level more often than
required in the PMCS.
Class III leaks should be reported to your supervisor or unit maintenance.
Leakage Definitions:
Class I
Seepage of fluid (as indicated by wetness or discoloration) not great enough to
form drops.
Class II
Leakage of fluid great enough to form drops but not enough to cause drops to
drip from item being checked/inspected.
Class III
Leakage of fluid great enough to form drops that fall from the item being
checked/inspected.
2-10. PMCS Procedures. Operator preventive maintenance checks and services are listed in table 2-1.
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