TM 9-4520-251-14
D TEMPERATURE SELECTOR VALVE. Turn handle clockwise for hotter air, counterclockwise for
cooler air.
E DISCHARGE TEMPERATURE GAUGE. Needlepoints to actual temperature of discharge air in de-
grees Fahrenheit.
F HANDLE (DAMPER). When facing hot air outlet, turn LEFT to open, RIGHT to close.
G SHUTDOWN BUTTON. Switch that stops engine by grounding spark plug voltage.
H LEVER (CHOKE). Control on carburetor allows operator to adjust fuel mix for starting.
I
RESTRICTION INDICATOR. Indicates that air filter needs servicing.
Section II. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
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GENERAL.
Preventive Maintenance Checks and Services (PMCS) are essential to the efficient operation of the heater
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 are de-
scribed in Table 2-1.
2-4 PREVENTIVE MAINTENANCE CHECKS AND SERVICES.
a. Table 2-1 lists the preventive maintenance checks and services which shall be performed at speci-
fied intervals by the operator/crew.
b. Item numbers are assigned to each check or service task. These numbers are to be used as a
source of item numbers for the TM Number column on DA Form 2404, Equipment Inspection and
Maintenance Worksheet, in recording results of PMCS.
c.
The “INTERVAL” column of Table 2-1 tells you when to do a certain check or service.
(1) Do your BEFORE (B) PMCS just before you operate the heater. Pay attention to WARNINGS,
CAUTIONS, and NOTES.
(2) Do your DURING(D) PMCS while you operate the heater. During operation means to monitor
the heater and its related components while it is actually being operated. Pay attention to
WARNINGS, CAUTIONS, and NOTES.
(3) Do your AFTER (A) PMCS right after operating the heater. Pay attention to WARNINGS, CAU-
TIONS, and NOTES.
(4) Do your WEEKLY (W) PMCS once a week.
(5) Do your MONTHLY (M) PMCS once a month.
d. The ITEM TO BE INSPECTED column lists the item to be checked or serviced. This column is com-
bined with the PROCEDURE column.
e.
The PROCEDURE column describes the procedure by which the check or service is to be per-
formed. Illustrations are included to assist in locating that part of the equipment requiring the check
or service.
f.
The NOT FULLY MISSION CAPABLE IF: column contains conditions that make the equipment not
ready/available for readiness reporting purposes.
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