TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 366 of 775

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.

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