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 NOTE Be sure MASTER switch is set to ON. 1 Open spring clip (11) on cab M2A2 air purifier (12) to expose air inlet holes. 2 Turn CAB NBC POWER switch (13) to ON and indicator light (14) will illuminate. 2-265