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 2–1 OPERATOR’S CONTROLS, INDICATORS, AND INSTRUMENTS — CONTINUED 2-1.1 Driver’s Controls and Indicators — Continued 15 16 17 M3 ELECTRICAL AIR HEATER Two M3 electrical air heaters provide heated air to the driver (M109A4/M109A5) and cannoneer no. 2 while operating in an NBC environment. DOME LIGHT SWITCH Turns dome light assembly to ON or OFF. PORTABLE INSTRUMENT PANEL Used by driver when driver is in raised position. 2-3