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 5–34 5–2 AUTHORIZED MUNITIONS — CONTINUED 5–2.2 Authorized Fuzes — Continued i. M577 Series and M582 Series Mechanical Time and Superquick Fuzes 1 The M577 series fuze (12) and M582 series fuze (13) have a 200 second mechanical time mechanism with three movable digital dials similar to a speedometer. Each fuze has a window through which the dials are viewed. The dials permit setting of the fuze to the nearest tenth of a second. The M577A1 and M582A1 fuzes contain a different mechanism for point detonating action. Externally the major difference is the configuration of the wrench slots. The M577A1 and M582A1 fuzes are handled, set, and fired the same as the basic models. Early manufactured basic and A1 fuzes have black paint finished ogives, while the later produced A1 fuze has a gold (chromite finish) color ogive. 2 The dial closest to the M577 series fuze (12) and M582 series fuze (13) nose indicates the time in hundreds of seconds. (The triangle (A ) position is a nontime setting). The second dial indicates time in ten second intervals. The third dial indicates the nearest second and also tenths of seconds by using the scale on the right edge of the dial. 3 The M582 series fuze (13) is fitted with a booster and is used with burster type projectiles. The M577 series fuze does not contain a booster and is used with base-ejection projectiles. In order to minimize identification problems, current production of the M582A1 fuzes contain a white stencil “M582A1” below the window of the fuze body. 4 The M577 series fuze (12) can be used with a special spotting charge when firing the M483A1 or M864 projectile in the self-registration mode (para 5–4). 5 If M577 series fuze (12) and M582 series fuze (13) are set for time and the timing mechanism fails, the fuze may or may not function on impact. 6 The M577 series fuze (12) and M582 series fuze (13) can be set with the M35 fuze setter or a flat-tip screwdriver. The time-setting key is located on the end of the fuze nose. The desired time is set under the hairline. Detailed setting instructions are outlined in paragraph 5–6. 7 The M577 series fuze (12) and M582 series fuze (13) are not sensitive to rain. 12 13