SB 742-1
h. Gage with a profile and alignment gage only if visually
questionable.
a. Primer is contained in M981 ignition cartridge. Ignition
i. Normally done only during first inspection and
cartridge should be fully assembled and in contact with fin
documented on DSR card to preclude repeat gaging. See para
rear boss.
b. Propellant sequence for NDI cartridges starting from
j. Discoloration of propellant charge containers is a result
front of cartridge must be 4 each white increments, followed by
of high humidity and temperature in storage. Color change is
2 blue increments with 1 brown increment at rear.
from normal light yellow to dark yellow to light green
c. Projectile body (HE or WP) with open or closed crack progressing to darker shades of green.
Splotches of
(cold shut) is a safety hazard during firing.
discoloration rather than a uniform transition of entire charge
d. Rigid propellant containers have a water resistant finish container evidences change. Corrosion on fin areas adjacent to
to protect propellant from moisture contamination. Cracks, propellant containers is normally associated with this
dents, seam, or propellant fill hole cover delamination or other discoloration. If this corrosion does not extend to other
damage would be classified as a major defect. If damage is portions of fin and flash holes are not obstructed this condition
severe enough to permit propellant to escape, the defect is is to be classified as incidental. Cartridges with discolored
critical. To check integrity of damaged propellant containers propellant charge containers or with foam from packing
place the charge on an M31 fin, oriented such that the supports adhering to propellant containers are to be assigned
propellant would be resting against the damaged surface and condition
code
C,
priority
of
issue.
hand shake vigorously three times.
e. When the component is damaged to the extent that its
functional effectiveness is impaired significantly, it will be
classified as a defect.
f. When the fin assembly can be turned upon application
of hand pressure, it will be classified as a defect.
g. NDI M57/M91 cartridges have obturators heat welded.
M900 series cartridge obturator ends are glued together with
adhesive.
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