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DRAFT
TB 9-2320-279-13-1
OPERATOR'S PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
INTRODUCTION
This work package contains Operator's PMCS requirements for the HEMTT AC system. The PMCS table in this
work package contains checks and services necessary to ensure that the AC system is ready for operation. Using
PMCS tables, perform maintenance at specified intervals. Perform PMCS listed in TM 9-2320-279-10, before
performing these PMCS checks.
GENERAL MAINTENANCE PROCEDURES
WARNING
Adhesives, solvents, and sealing compounds can burn easily, can give off harmful
vapors and are harmful to skin and clothing. To avoid injury or death, keep away
from open fire and use in well-ventilated areas. If adhesive, solvent, or sealing
compound gets on skin or clothing, wash immediately with soap and water.
a. Cleanliness.
Dirt, grease, oil, and debris may cause or cover a serious problem. Clean all metal surfaces.
b. Bolts, nuts, and screws.  Check bolts, nuts, and screws for obvious looseness, missing, bent, or broken
condition. Look for chipped paint, bare metal, or rust around bolt heads. If any part seems loose, tighten it, or have
the part repaired or replaced.
c. Welds.
Look for loose or chipped paint, rust, or gaps on welds. If a bad weld is found, notify Field Level
Maintenance.
d. Electrical wires and connectors. Look for cracked or broken insulation, bare wires, and loose or broken
connectors. Tighten loose connectors and make sure wires are in good shape. If a wire or connector is bad, notify
Field Level Maintenance.
e. AC system leaks.  Look for air conditioner lubrication leakage and corrosion, and damage to fittings,
hoses, and other components. Inspect lowest points of fittings, and hoses for indication of lubrication leakage.
If lubrication leakage is found, notify Field Level Maintenance.
NOTE
Always observe the warnings and cautions appearing in your PMCS table. Warnings and
cautions appear before applicable procedures. You must observe these warnings and
cautions to prevent serious injury to yourself and others or prevent equipment from being
damaged.
EXPLANATION OF TABLE ENTRIES
a. "Item No." Column.  Items in this column are for reference. When completing DA Form 2404 (Equipment
Inspection and Maintenance Worksheet), include the item number for the check/service indicating a fault. Item
numbers also appear in the order that you must do the checks and services for the intervals listed.
b. "Interval" Column.  This column describes when, and how often, the check is to be made. Thus, if a given
check is performed before operation, the word Before is opposite the check in the Interval column.

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