SB 742-1
(b)
shall have loose strands trimmed and be touched up with
Apply a thin coat of wash primer DOD-P-
OD paint.
15328, NSN 8010-01-124-8193 or 8010-01-127-6896.
Allow 15 minutes minimum to two hours maximum drying
(4) Projectiles having circumferential gouges
time for primer.
greater than one inch in length with a full length depth of
0.100-inch or more and greater than 0.250-inch
(c)
Apply enamel, color number 34088 of
longitudinal width shall be rejected. All others shall have
FED-STD-595, MIL-E-52891, NSN 8010-00-848-9272,
loose strands trimmed and be touched up with OD paint.
8010-00-297-2116, or 8010-00-297-2113. Allow one hour
or more to dry enamel. Drying time may be minimized by
e. There shall be no movement when a rocking or
application of heat and/or forced air.
rotating motion is applied to the ogive by hand.
(4) Take the following action when corrosion on
f. Markings.
old style bases is detected:
(1) M483 and M483A1 - Diamonds.
(a) Report any lot rejected due to base
(2) M731, M741 and M741A1 - Triangles with "S".
corrosion to HQ, JMC as required by this supply bulletin
(Short mine self-destruct time).
and DA PAM 738-750. This defect is considered to be a
factor of environment.
Lots will not be suspended
(3) M692, M718 and M718A1 - Triangles with "L".
worldwide based on reports of base corrosion.
(Long mine self-destruct time).
(b)
g. The following procedures apply to inspection for
Lots rejected due to base corrosion will be
base corrosion on projectile bases:
retained in an unserviceable condition code, not authorized
for emergency combat. As a rule, it is desirable to perform
(1) Corrosion on the new style base will be
a 100 percent screening of rejected lots when identified. If
classified as an incidental defect. Rust in the base/body
local authorities determine that screening is not
gap will be classified a minor defect if the gap meets
immediately required, defective lot will be scheduled for
tolerance as reflected in para N-6a.
base replacement.
(2) Remove the grommet and visually inspect the
h. Remove pallet tops and inspect that portion of
area at base/body joint for rust or corrosion and the entire
aluminum ogive that is in contact with pallet top for
base for corrosion. White aluminum oxide and roughening
corrosion or pitting. This area is especially prone to
or pitting of base surface indicates aluminum corrosion.
removal of protective alodine finish.
(a) If necessary for inspection, clean external
i. Inspect fusible plugs for bent or cracked lifting ring,
surface of base with a clean, lint-free rag or soft brush. Do
dislodged or missing fusible disc or possible leakers.
not use a wire brush or any material that may abrade
Leakers are recognizable by a ring of rust or cracked paint
coating on base. Damage to coating may contribute to
around periphery at interface of disc and hole.
development of corrosion during long-term storage.
Alcohol (i.e., methyl, ethyl, or isopropyl) may be used
j. Do not reject a lot for deformed, cracked or
sparingly as a cleaning agent. Do not use chlorinated or
deteriorated rubber gaskets, PN 8860552.
Replace
petroleum based agents (e.g., gasoline, mineral spirits,
defective rubber gaskets encountered during inspection.
acetone, ketone, etc.). Obturator ring between rotating
band and base is made of polyvinyl chloride (PVC), which
k.
A cut across the entire width and to a depth of
may be damaged by exposure to improper solvents.
more than half the height of band above body surface.
Damage may not be immediately apparent, but such
(Depth of cut not to exceed 1/16-inch). Hairline cracks,
exposure could cause obturator to break during long-term
which are a result of the production process, are
storage.
acceptable.
(b) Reinspect any area in question to
l.
Inspect closely for onset of corrosion, especially on
establish if coating surface is intact (not pitted). If coating
aluminum parts.
is intact, area is not a defect. Surface irregularities may be
present, including nicks and pings with aluminum base
m. Rust in the base/body gap will be classified a
material displaced.
Condition is a common result of
minor defect if no base corrosion is in evidence and the gap
manufacturing or handling and should not be considered a
meets tolerance as reflected in para N-6a.
defect if corrosion is not present.
If corrosion has
blossomed (raised material resulting from corrosion
n.
M483A1, M692, and M731 with old style base.
formation), base is defective and must be classified
according to table N-3.
o.
M718 and M741 with old style base.
(c) Red or brown discoloration on the base is
generally a result of rust on projectile surfaces or in the
base/body gap and should be treated as an incidental
defect.
(3) If damage to the coating on the base with no
indication of corrosion is noted during inspection, a touch-
up coating shall be applied to bare spots as follows:
(a) Clean touch-up area
with
alcohol
immediately prior to finishing operation.
N-3
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