TM 9-4120-407-14
SECTION II OPERATOR PREVENTIVE MAINTENANCE CHECKS AND
SERVICES (PMCS)
2-4. GENERAL. Preventive Maintenance Checks and Services (PMCS) are essential to the efficient
operation of the air conditioner and to prevent possible damage that might occur through neglect or failure
to observe warning symptoms in a timely manner. Checks and services performed by operators are limited to
those functions which can be done from the outside of the cabinet. The Preventive Maintenance Checks and
Services Table 2-1 lists the inspections and care of the air conditioner required to keep it in good operating
condition.
a . Warning and Cautions. 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 your equipment from being
damaged.
b. Explanation of Table Entries.
(1) Item Number Column. Numbers 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 checks and services for the
intervals listed.
(2) Interval Column. This column tells you when you must do the procedure in the procedure column.
BEFORE procedures must be done before you operate or use the equipment for its intended mission. DURING
procedures must be done during the time you are operating or using the equipment for its intended mission.
AFTER procedures must be done immediately after you have operated or used the equipment. When a check
and service procedure is required for both WEEKLY and BEFORE intervals, it is not necessary to do the
procedure twice if the equipment is operating during the WEEKLY period.
(3) Location, Check/Service Column. This column provides the location and the item to be checked or
serviced. The item location is underlined.
(4) Procedure Column. This column gives the procedure you must do to check or service the item listed
in the Check/Service column to know if the equipment is ready or available for its intended mission or for
operation. You must do the procedure at the time stated in the interval column.
(5) Not Fully Mission Capable If: Column. Information in this column tells you what faults will keep
your equipment from being capable of performing its primary mission. If you make check and service
procedures that show faults listed in this column, do not operate the equipment. Follow standard operating
procedures for maintaining the equipment or reporting equipment failure.
c. Other Table Entries. Be sure to observe all special information and notes that appear in your table.
2-5
