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TM 5-4120-377-14
Section IV PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS)
4-15.
INTRODUCTION, INSPECTION, AND SERVICE
a. Systematic, periodic, Preventive Maintenance Checks and Services (PMCS) are essential to ensure that
the air conditioner is ready for operation at all times. The purpose of a preventive maintenance program is to
discover and correct defects and deficiencies before they can cause serious damage or complete failure of the
equipment. Any effective preventive maintenance program must begin with the indoctrination of operators to
report all unusual conditions noted during daily checks or actual operation to organizational maintenance. All
defects and deficiencies discovered during maintenance inspections must be recorded, together with
corrective action taken, on DA Form 2404 (Equipment Inspection and Maintenance Worksheet).
b. A schedule for organizational preventive maintenance inspection and service should be established
immediately after installation of the air conditioner. A quarterly interval, equal to three calendar months or 250
hours of operation (whichever occurs first) is recommended for usual operating conditions. When operating
under unusual conditions, such as a very dusty or sandy environment, it may be necessary to reduce the
interval to monthly or even less if conditions are extreme.
c. Table 4-1 lists the organizational preventive maintenance checks and services that should be performed
at quarterly (or otherwise established) intervals. The PMCS items in the table have been arranged and
numbered in a logical sequence to provide for greater personnel efficiency and least amount of required
maintenance downtime.
Disconnect input power before disassembly of air conditioner for PMCS to prevent dangerous,
possibly fatal, electrical shock.
4-30
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