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 5-48 5-5 FUZES a. General There are four basic types of fuzes: impact, mechanical time, electronic time, and proximity variable time (VT) fuzes. On command, “FUZE,” cannoneer no. 2 must select the right fuze, unpack, inspect, install it in the projectile, and set it as commanded (TIME, SUPERQUICK, DELAY). b. Removal of Lifting Plug WARNING • Do not use the M549/M549A1 projectile if the lifting plug has been broken to prevent injury to personnel. Do not attempt to extract any portion of the lifting plug from the fuze well of the projectile. Return projectile to the ammunition supply point. • Do not use a projectile with explosive on the threads or evidence of explosive powder seepage. It could cause detonation of the projectile, if fired, resulting in possible bodily injury. 1 Remove lifting plug (1) and inspect the spacer (2) beneath the lifting plug. 2 Inspect cavity and projectile threads for damage. Remove loose material from cavity. If any high explosive is found stuck to the threaded portion of the projectile throat, do not fire. c. Supplementary Charge WARNING • Do not fire point–detonating (PD), mechanical time and superquick (MTSQ), electronic time (ET), or the short–intrusion variable time (VT) fuzes in a deep– cavity projectile without the supplementary charge as an inbore premature may result. • Do not attempt to remove supplementary charge by any means other than the lifting loop. Use of screwdrivers or other tools to remove the charge by force is dangerous. For the long–intrusion proximity fuze (3) firings, remove supplementary charge (4) by means of its lifting loop (5). If the supplementary charge cannot be removed by its lifting loop, either fire with a short– intrusion VT, PD, ET, or MTSQ fuze (6) or dispose of the round.