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TM 3-6665-225-12
Figure 2-1. M43 detector unit controls and instruments.
to OFF, the annunciator shows a black/white
connected and the ac power source is dis-
indication.
connected, or if the power switch (3) is positioned
Section II. OPERATION UNDER USUAL CONDITIONS
2-5. General
for two or more continuous missions,
perform checks and reservicing pro-
This section contains instructions for inspecting,
preparing, testing, and placing the alarm system
cedures (para 2-10) after each 12-hour
mission.
under usual
into operation
equipment
environmental conditions. Usual environmental
26. Preoperational Procedures
conditions are defined as ambient air temperature
These procedures prescribe mandatory equipment
above 40F., no precipitation, and no apparent
inspections prior to preparing the equipment for
presence of blowing dust or sand. For operation in
operation.
temperatures below 40F.; in rain, sleet, or snow;
NOTE
or in blowing dust or sand; refer to paragraphs
Inspect exterior of M43 detector unit for
2-15 through 2-17 for special instructions for
cracks or breaks and loose or missing
operation under unusual conditions.
parts. Turn in a unit suspect of damage
NOTE
or inability to operate properly because
If the alarm system is to be operational
of visible deficiencies.
2-2
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