TM 9-6115-664-13&P
2-5. LEAKAGE DEFINITIONS FOR OPERATOR PMCS.
It is necessary for you to know how fluid leakage affects the APU and mating vehicle. Following are types/classes of
leakage an operator needs to know to be able to determine the status of the APU. Learn these leakage definitions and
remember - when in doubt, notify your supervisor.
CAUTION
Equipment operation is allowable with minor leakages (Class I or II). 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 in
your PMCS.
Class III leaks should be reported immediately to your 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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