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 - Page 580 of 775
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.
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