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 5-2 AUTHORIZED MUNITIONS — CONTINUED 5-2.2 Authorized Fuzes — Continued e. M564 Mechanical Time and Superquick Fuze The M564 fuze (6) is an improvement over the older MTSQ fuzes, in that it provides a longer timing mechanism (100 seconds) for functioning at longer ranges. The date of manufacture is stamped on the fuze body before the lot number. Fuzes manufactured through 1969 must be set on 90 seconds if superquick (impact) action is desired. Setting of these fuzes between S and 2 seconds may result in functioning after approximately 2 seconds. Fuzes manufactured since 1970 may be set as shipped on S for superquick (impact) functioning. Premature functioning of the fuze may occur downrange if the fuze is fired in heavy precipitation; i.e., rainfall, sleet, snow, or hail. f. M565 Mechanical Time Fuze The M565 fuze (7) mechanical time (MT) fuze is similar to the M564 fuze (6) except that the M565 fuze does not contain the point detonating assembly or the booster assembly. The M565 fuze can be set from 2 to 100 seconds. Like the M564 fuze, the M565 fuze has a vernier scale to assure a setting accuracy of 0.1 seconds. The M565 fuze is used with base-ejection projectiles only. 5-32