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TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download

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TM 9-2350-311-10 2-17 OPERATING AUXILIARY EQUIPMENT — CONTINUED 2-17.6 NBC Equipment (M109A4/M109A5 Howitzers) — Continued c. Operation of Cab NBC Equipment — Continued NOTE Illustration for steps 3 and 4 shows section chief station, but procedures apply to cannoneer no.1‘s, gunner’s, assistant gunner’s, and section chief’s stations. 3 Pull orifice connector (15) from bracket (16) and connect to M25A1 mask (not shown). NOTE Indicator light on M3 electrical air heater will go off and on during operation as heating element adjusts to control air temperature. 4 Turn THERMOSTAT control knob (17) on M3 electrical air heater (9) to ON and incandescent lamp (18) will illuminate. Adjust air temperature for comfort. 2-266