TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994
TM-9-2350-311-10

  TM-9-2350-311-10 - Page 564 of 775

TM 9-2350-311-10
5-36
Change 4
5-2
AUTHORIZED MUNITIONS — CONTINUED
5-2.2
Authorized Fuzes — Continued
j.
M762 and M767 Series Electronic Time (ET) Fuze — Continued
2
The M762 series fuze (14) and M767 series fuze (15) contain an electromechanical safe and arming
mechanism (S&A). When set for time function, the S&A provides overhead safety by arming at
50 milliseconds before set time. For this reason, if the fuze impacts before a time setting expires,
there will be no point detonating (PD) back-up function. For PD setting, the S&A arms the fuze at
0.45 seconds in flight. Upon impact, a crush switch assembly (contained in the ogive) senses the
impact and transmits a fire signal for PD action.
3
The M762 series fuze (14) and M767 series fuze (15) can be set either by hand (rotating ogive) and
depressing selector and cocking button or remotely by a weapon equipped with auto-set fire control
system. Detailed setting instructions are outlined in paragraph 5-6. The settings can be changed as
many times as required for the duration of the activated life of the battery.
4
The M762 fuze (14) and M767 fuze (15) bodies are anodized gold. The rear portion of the ogive is
coated with a gold phosphate finish. The forward portion of the ogive is brown plastic for the basic fuzes
and black plastic for the M762A1 and M767A1 fuzes. The nose cap is unpainted bronze for the basic
fuzes and stainless steel for the M762A1/M767A1.
5
The M762 series fuze (14) does not contain a booster and is used with base-ejection projectiles. The
M767 series fuze (15) is fitted with a booster for firing with burster type and high explosive projectiles.
6
The M762 series fuze (14) can be used with a special spotting charge when firing the M483A1 and
M864 projectiles in the self-registration mode (para 5-4).
7
If the M762 series fuze (14) and M767 series fuze (15) fail in the time mode, there is no PD backup
function.
8
The M762 series fuze (14) and M767 series fuze (15) are not sensitive to rain.
14
15


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