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UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Preventive Maintenance Checks and Services (PMCS) are performed to keep the FC equipment in operating
condition. The checks are used to find, correct or report problems.
If you find something wrong when performing PMCS, fix it if you can, using troubleshooting procedures and/or
The right-hand column of the PMCS table lists conditions that make the vessel not fully mission capable. Write up
items not fixed on DA Form 2404. For further information on how to use this form, see DA PAM 738-750.
Equipment operation is allowed with minor leakages (Class I or II) except for fuel
leaks. Of course, consideration must be given to the fluid capacity of the item or
system being checked. When in doubt, ask 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.
It is necessary to know how fluid leakage affects the status of the equipment. The following are definitions of the
classes of leakage an operator or crew member needs to know to be able to determine the condition of the leak. Learn
and then be familiar with them, and REMEMBER - WHEN IN DOUBT, ASK YOUR SUPERVISOR.
Leakage definitions for Unit, Direct Support and General Support 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 item
CLASS III - Leakage of fluid great enough to form drops that fall from the item being checked.
Look for signs of a problem or trouble. Senses help here. You can feel, smell, hear or see many problems. Be alert
when on the equipment.
Inspect to see if items are in good condition. Are they correctly assembled, stowed, secured, excessively worn,
leaking, corroded or properly lubricated? Correct any problems found or notify your supervisor.
There are some common items to check all over the equipment. These include the following:
Bolts, clamps, nuts and screws: Continuously check for looseness. Look for chipped paint, bare metal, rust or
corrosion around bolt and screw heads and nuts. Tighten them when you find them loose.