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TM 10-4320-311-14
2-4. Leakage Classifications and Definitions.
Classification
Definition
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 cause drops to drip from item being checked/inspected.
CAUTION
Equipment operation Is allowable with minor leakages (Class I or II). Of course, you must consider
the fluid capacity In the Item/system being checked/inspected. When in doubt, notify your
supervisor.
When operating with Class I or Class II leaks, continue to check fluid levels as required In your
PMCS.
Class III leaks must be reported to supervisor or unit maintenance.
2-6
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