Section II. OPERATION UNDER USUAL CONDITIONS

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