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ARMY TM 94120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9136-31
Section IV. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
4-15. INTRODUCTION.
a. General
(1) 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 unit 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).
(2) A schedule for unit 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 very dusty or sandy environment, it may be necessary to reduce the interval to
monthly or even less if conditions are extreme.
(3) Table 4-1 lists the unit 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 the least amount of required maintenance downtime.
b. PMCS Columnar Entries.
(1) Item number column. This is the order in which you perform checks and services on the air conditioner. The
entry in this column will also be used as a source of item numbers for the '"TM Item Number" column on DA
form 2404, Equipment Inspection and Maintenance Worksheet, in recording results of PMCS.
(2) Interval. This is the timeframe when a certain check or service should be performed.
(3) Item to check/service column. Identification of item to be inspected.
(4) Procedures column. The procedures column of your PMCS table tells you how to do the required checks and
services. Carefully follow these instructions. If you do not have the tools, or if the procedure tells you to,
have the next higher level of maintenance do the work.
(5) Not fully mission capable if: Entries in this column will be keyed specifically to checks listed in the
"procedures" column for the purpose of identifying, for the check, the criteria that will cause the equipment to
be classified as not fully mission capable because of inability to perform its primary combat mission.
WARNING
Disconnect input power before disassembly of the air conditioner for PMCS to prevent dangerous, possible fatal,
electrical shock.
Table 4-1. Unit Preventive Maintenance Checks and Services
Item
Inter-
Items to
Not Fully Mission
No.
Val
Check/
Procedure
Capable If:
Service
1
Quarterly
Information
a.
Check that information plates are readable
Plates
and in place.
b.
Replace plates if damaged (para 4-26).
Plates are
damaged.
4-15
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