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 609 of 775
TM 9--2350--311--10
Change 4
5--73
5--12 MAINTENANCE — CONTINUED
b. Projectiles — Continued
2
Clean dirt or foreign material from projectile by wiping with a damp rag (item 35, Appx D).
3
Return defective projectiles to ammunition supply point (ASP).
4
Inspect the M549/M549A1 projectile for the following.
(a) Missing or broken obturating bands. The M549/M549A1 projectile cannot be used if the obturating
band is broken or missing. Return M549/M549A1 projectile to the supply point.
(b) Broken energy-absorbing or shock attenuating lifting plugs. When the lifting plug is broken, the
threaded area will remain in the M549/M549A1 projectile. Do not attempt to extract any portion of
the broken plug. Return the M549/M549A1 projectile to the supply point.
5
The M483A1 projectile can be used if the obturating band is missing or broken. Remove and discard
broken obturating bands.
6
Inspect the M864 projectile for the following.
(a) Missing or broken obturating bands. Do not fire the M864 projectile if the obturating band is broken
or missing as rotating band failure and short rounds may result. Return M864 projectile to the
supply point. If the band is displaced and can be repositioned and remain in the groove, the M864
projectile can be fired.
(b) Damaged (torn, punctured, or peeling) weather seal. The M864 projectile cannot be used if the
weather seal is damaged. Return M864 projectile to the supply point.
(c)
Gaps at the base to body joint. If a separation of base from the body exists, refer to the safety
precautions on M864 projectile in Table 5--1.
7
Inspect specially marked M864 projectiles (three solid white circles located on the ogive) for the
following.
(a) M864 projectiles that have not been palletized or have been transported as loose cargo. These
conditions can cause gaps or separation at the base to body joint resulting in a hazard. Return the
M864 projectile to the supply point.
(b) Projectiles showing denting, flattening, or gouging to the lifting plug, grommet, rotating band, or
boatail area. These conditions can cause gaps or separation at the base to body joint resulting in a
hazard. Return the M864 projectile to the supply point.
8
The M825/M825A1 cannot be fired if the obturator is missing or broken because it may result in a short
round. If the band is displaced and can be repositioned and remain in the groove, the projectile can be
fired.
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