TM 9-2320-285-10
2-12. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (Continued)
Leakage Definitions for Operator PMCS
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
the item being checked/inspected.
Class III
Leakage of fluid great enough to form drops that fall from the item being
checked/inspected.
CAUTION
Equipment operation is allowable with minor leakage (Class I or II). Of course, consideration must be
given to the fluid capacity in the item/system being checked or inspected. When operating equipment with
Class I or II leaks, continue to check fluid levels as required in your PMCS. Class III leaks should be
reported to your supervisor or Organizational Maintenance.
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