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 2–15 MISFIRE PROCEDURES — CONTINUED 2–15.2 Preventive and Corrective Measures When Howitzer Fails to Fire a. Charge 2 Misfire in a Cold Cannon Tube 1 2 3 4 5 If a weapon fails to fire after one attempt to fire, immediately attempt to refire two more times. • Primer removal may expose cannoneer to the danger of a recoiling weapon if a hangfire condition exists. ● Stickers may infrequently occur when firing charge 2. When stickers occur, projectile lodges in cannon tube and hot gases under pressure are trapped in primer chamber. Removal of primer is dangerous as it will be expelled rearward when released. Expelled primer may cause injury to personnel standing in its path of ricochet. • Stand clear of recoiling parts, exposing only hand and arm, when removing primer, before the end of safe wait period. ● Do not grasp lock pin, so that your hand is exposed to being hit by expelled primer. If weapon still fails to fire: (a) Wait 10 minutes. (b) Open hull door. (c) Position cannon tube so that primer can be expelled through hull rear door, should there be a sticker. Stand to right side of breech. Grab follower assembly knob and pull outward until it is free to be opened. Keeping follower assembly knob out, firmly slide block assembly toward the open position until primer pops and gases are vented, If a sticker occurs, refire at charge 4 or above with proper authority. If sticker cannot be fired at higher charge, notify EOD. NOTE No significant range loss is expected when firing sticker. If a sticker is not involved, replace faulty component, and refire or clear weapon. 2-242