SB 742-1
CARTRIDGE, 60-MM MORTAR
Items will be inspected and classified according to the
appropriate paragraphs of this supply bulletin and table F-2.
a. FSC: 1310.
a. All models with fuzes requiring safety wires.
b. Ammunition type: Cartridge, 60-mm mortar. Includes
the M49-series (HE), M50-series (TP), M69 (training), M83-
b. All models with M65 series fuze.
series illuminating), M302-series (WP), M720 (HE), and M888
(HE) models.
c. All applicable fuze models.
c. 60-mm cartridges are fin-stabilized rounds fired from
d. Profile and alignment gage.
Gage if visually
smooth bore weapons.
A complete round consists of a questionable.
projectile, fin assembly, ignition cartridge, primer, propelling
e. Place the damaged charge on a M27 fin, oriented so that
charge, and a fuze (the M69 trainer does not have a fuze). For
a complete description of these rounds, see TM 43-0001-28 the propellant rests against the damaged surface. Vigorously
shake the fin and charge three times. If any propellant is
and the drawing for the particular round.
spilled the damaged charge must be classified as a critical
defect. If no propellant is spilled the damaged charge will be
classed as a major defect.
No unique safety precautions are applicable to this item.
f. Ignition cartridge must be assembled with red end next
to the primers. (Dwg 9207925 and 9220383).
a. All IRI samples will be gaged using a profile and
g. Normally done only during initial receipt inspection as
alignment gage. Gaging is not normally required during PI, RI, stated in paragraph F-3a.
or UBLI. Gaging, during these inspections (other than IRI),
should be limited to individual rounds having visual evidence
h. When a component is damaged, or incorrectly
of damage or other conditions that may preclude loading and assembled, so as to affect the functioning or reliability of the
firing.
Unless the rounds requiring gaging are truly round, it will be classified as a defect.
representative of the lot being inspected, they should be
i. Discoloration of propelling charge containers is a result
disregarded in evaluating the lot.
of high humidity and temperature in storage. Color change is
b. Table F-1 identifies test and measurement equipment.
from normal light yellow to dark yellow to light green
progressing to darker shades of green.
Splotches of
discoloration rather than a uniform transition of entire charge
.
container evidences change. When discoloration is present
Gage, profile and alignment
inspections should focus on:
Drawing
NSN
Preferred
Application
(1) Possible residue buildup on the portion of the fin
Gage
which is adjacent to the propellant containers.
7256348
5220-00-
YES
All models
305-6030
(2) Deterioration of polyurethane foam lining of the
5539280
5220-00-
NO
All models
propellant charge supports. Breakdown of this foam leaves
395-4450
complete
residue on the charge containers.
7256419
5220-00-
NO
Short rounds
(3) Cartridges are to be considered serviceable if
395-4457
only
discolored propellant containers are hard, intact and buildup
6518134
5220-00-
NO
Short rounds
does not cover ignition flash holes. Cartridges exhibiting these
395-4423
only
conditions or with foam adhering to the propellant containers
7258360 5220-00-
NO
Short rounds
are to be assigned condition code C for priority of issue.
395-4466
only
Note
Non-preferred gages will not be requisitioned or
purchased but may be used if on-hand and
serviceable
a. Inspection category.
(1) Category V: 6 years (includes jungle pack HE, WP
and TP).
(2) Category W: 5 years (includes inert items and
jungle packed illuminating cartridges).
(3) Category X: 4 years (includes HE, WP and TP not
in jungle pack).
(4) Category Y:
3
years
(includes
illuminating
cartridges not in jungle pack).
(5) Inspection interval is to be reduced to 2 years for
cartridge lots assigned condition code C due to discolored
propellant.
b. The sampling plan for inspection is according to
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