SB 742-1
ITD, (DSN 793-6973) as required by para 2-2b must include
adequate justification of need for drawings.
CARTRIDGE, 120MM MORTAR
f. Packaging of NDI cartridges is 1 round per fiber
container, 2 fiber containers per wooden box.
Later US
a. DODACs and ammunition type:
production is packed 1 cartridge per fiber container, PA 153, 2
fibers per metal can, PA 154.
(1) 1315-C788: Cartridge, 120MM, HE, M57 (NDI).
g. Palletization of M900 series cartridges will be in
(2) 1315-C790: Cartridge, 120MM, Illum, M91 (NDI)
accordance with drawing 19-48-4116, Appendix 38A.
(3) 1315-CA03: Cartridge, 120MM, WP, M929.
(4) 1315-C625: Cartridge, 120MM, Illum, XM930 (still
No unique safety precautions are applicable to this item.
in development).
(5) 1315-CA09: Cartridge, 120MM, Full Range,
Practice, M931.
a. Gaging policy is provided in chapter 2 of this SB.
Gaging is not normally required during PI, RI, or UBLI.
(6) 1315-C623: Cartridge, 120MM, HE, M933.
Gaging, during these inspections (other than IRI), should be
limited to individual rounds having visual evidence of damage
(7) 1315-C379: Cartridge, 120MM, HE, M934.
or other conditions that may preclude loading and firing.
(8) 1315-C379: Cartridge, 120MM, HE, M934A1.
Unless the rounds requiring gaging are truly representative of
the lot being inspected, they should be disregarded in
(9) 1315-CA07: Cartridge, 120MM, Illum, IR, XM983
evaluating the lot.
(still in development).
b. A gage for 120mm ammunition is not available at this
NOTE
time.
AMC Project Manager for Mortars is working to
develop/procure a profile and alignment gage for 120mm
M57 and M91 cartridges not authorized with carrier
cartridges.
mounted M121 mortar due to overpressure safety
concerns.
b. Early procurement of 120mm ammunition from foreign
a. Inspection category.
sources was designated M57 (C788) for high explosive or M91
(C790) for illuminating cartridges. A total of 57,000 HE, M57
(1) Category V:
6 years (includes HE, WP, and
and 9,000 Illum, M91 cartridges were purchased from foreign practice cartridges overpacked in PA154 metal containers).
sources.
This stock is frequently referred to as a
(2) Category W: 5 years (includes inert items and
nondevelopmental item (NDI). These NDI cartridges have a
unique propelling charge configuration. Fuzes for M57 HE illuminating cartridges overpacked in PA154 metal containers).
cartridges are US manufactured M935 PD fuzes. The one lot of
(3) Category X: 4 years (includes NDI HE cartridges
M91 illuminating cartridges is assembled with DM93
in fiber containers in wooden boxes).
mechanical time fuzes. Cartridge model numbers have been
changed for later production in the USA. Inspection criteria
(4) Category Y: 3 years (includes NDI illuminating
will apply to both foreign procurement and US production cartridges in fiber containers in wooden boxes, ignition
unless indicated otherwise.
cartridges and bulk propellant increments).
c. 120mm cartridges are fin-stabilized rounds fired from
(5) Inspection interval is to be reduced to 2 years for
smooth bore weapons. Weapons include M120 mortar for
cartridge lots assigned condition code C due to discolored
ground emplacement and M121 carrier mounted mortar.
propellant or to foam from packing supports adhering to
Information pertaining to weapons, authorized cartridges and
propellant containers.
firing procedures is contained in TM 9-1015-250-10.
A
b. The sampling plan to be used for inspection is found in
complete round (except NDI) consists of a projectile, fuze, M31
fin assembly, M981 ignition cartridge and four M230 propelling
charges. For a complete description of these rounds see TM
43-0001-028 and TM 9-1300-251-20/34.
a. Items will be inspected and defects classified according
d. Sub caliber device, M303 is an 81mm, M29 series
to table Y-1.
mortar tube with an adapter. This device, when inserted into
the 120mm tube permits firing of 81mm M300 series and
b. Drawings require packaging of all 120mm, M929 WP
M880 short range (practice) ammunition. Ammunition fired
cartridges in fiber inner containers (PA153) and Metal outer
from this subcaliber device will be inspected using appendix G
containers (PA154) to be marked "this end up." This is to
for 81mm mortar ammunition.
Information pertaining to
permit identification of correct orientation when palletized and
weapon authorized cartridges and firing procedures is
in storage.
Requirement is to store and transport WP
contained in TM 9-1015-254-13&P.
cartridges in a nose up configuration. When packaged or
unitized in other orientations and subjected to high
e. Drawings for 120mm mortar cartridges are proprietary temperatures (111+ degrees F) filler may melt, change position
and authorized only limited distribution.
Any request (hence center of gravity), and upon solidification cause poor
submitted to Commander, Rock Island Arsenal, ATTN: SIORI- ballistics
with
resultant
short
rounds.
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