OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) INTRODUCTION
1. To ensure that the M9 ACE is ready for operation at all times, it must be inspected on a regular basis so
that defects may be found before they result in serious equipment damage, equipment failure, or injury to
personnel. This section contains systematic instructions on inspections, adjustments, and corrections to be
performed by the operator/crew.
2. While performing PMCS, read and follow all safety instructions found in the warning summary at the front
of this manual. Keep in mind all WARNINGs and CAUTIONs.
Perform Operator Preventive Maintenance Checks and Services (PMCS) (WP 0018) at the following intervals:
1. Perform "After" PMCS right after operating the M9 ACE.
2. Perform "Weekly" PMCS once each week.
3. Perform "Quarterly" PMCS once every three months.
All defects that the operator cannot fix must be reported on DA Form 2404 or DA Form 5988-E immediately after
completing PMCS. If a serious problem is found, IMMEDIATELY report it to your supervisor.
1. It is important to know how fluid leakage affects the status of the M9 ACE. The following are types/classes
of leakage an operator must know to determine whether the M9 ACE is mission capable. Learn these leakage
definitions. When in doubt, notify your supervisor.
a. Class I: Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
b. Class II: Leakage great enough to form drops, but not great enough to cause drops to drip from item
Class III: Leakage of fluid great enough to form drops that fall from the item being inspected.
Equipment operation is allowable with minor leakage (Class I or Class 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 should be reported to your supervisor, or Field Maintenance.
2. Equipment operation is allowed with minor (Class I or II) leakage. Fluid levels in an item/system affected
with such leakage must be checked more frequently than required in PMCS. When in doubt, notify your
3. Report Class III leaks IMMEDIATELY to your supervisor or Field Maintenance.