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 2–12 PREPARATION FOR FIRING — CONTINUED 2-12.7 Direct Fire Procedures a. General Direct fire on targets located closer than 875 yards (800 m) from the howitzer will be fired on during combat situations only. Lethal fragments can travel up to 656 yards (600 m) from point of burst causing injury to personnel. Direct fire is used against either stationary or moving targets at close range (normally less than 2,187 yards (2,000 m)). The section will usually fire the HE projectile and highest authorized charge. Either fuze quick, delay, or time maybe used. Fuze quick is best against close-in targets. There are three direct fire techniques: Two man/two sight Two man/one sight One man/one sight The two man/two sight technique is the primary means of direct fire. One man/one sight is least effective. All three techniques will be covered in the following pages. The next steps apply to all three direct fire techniques. 1 All numbered cannoneers perform the same duties in direct fire as they do during indirect fire missions. Driver’s hatch cover must be closed to guard against pressure from cannon blast. 2 Driver must be in driver’s compartment with engine operating and ready to move howitzer, if necessary. b. Two Man/Two Sight System NOTE When command to engage in direct fire is given, chief of section is in complete control and directs firing of this section. 1 Chief of section first identifies designated target. If target consists of several weapons, chief of section selects target that is the greatest threat to position. 2-223