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 5--68 Change 4 5--8 LOADING AND FIRING — CONTINUED 6 Remove the igniter protective cap from propelling charge and load propelling charge into cannon chamber with igniter end (red bag) toward the breechblock assembly. WARNING Never close the breechblock assembly unless you can see the red igniter pad on the base of the propelling charge. Misfires, hangfires, erratic performance, or other critical malfunctions could result causing injury to personnel. 7 Close and lock the breechblock assembly. WARNING Never insert primer in primer chamber unless breechblock assembly is closed and locked. Ignition of the propelling charge with breechblock assembly not fully closed presents a critical hazard to the crew. 8 Insert primer and move firing mechanism block assembly to firing position and fire on command of the chief of section.