PROJECTILE, 155MM, ICM FAMILY
Old Style Base
New Style Base
a. FSC: 1320.
b. Ammunition type: Projectile, 155mm HE, Improved
Conventional Munitions (ICM).
Includes model numbers
M483A1, M692, M718, M718A1, M731, M741, and M741A1.
c. The M483A1 family of projectiles has metal parts
comprised of four main components (less cargo).
components and basic material compositions are as follows:
(1) Ogive: aluminum (alodined).
(2) Body: steel/fiberglass.
(3) Base: aluminum (anodized).
(4) Fusible lifting plug: steel.
d. The design and material composition of the M483A1
N-2. Unique safety precautions.
family represents a departure from previous generations of
Exercise extreme care when handling a projectile with an
artillery ammunition. These design and/or material changes
exposed or damaged cargo of submissiles (grenades or mines)
warrant special emphasis during the life cycle surveillance of
or a loose base. Submissiles can fall out, arm, and explode
these munitions. Areas of emphasis are specified in para N-5
with lethality of a fragmentation hand grenade.
of this appendix. For a complete, detailed description of the
M483A1 family, see TMs and Dwgs.
N-3. Testing and equipment requirements.
e. Projectile models M483A1, M692 and M731 are thin
based projectiles. The aluminum bases on these models,
Table N-2 identifies test
and measurement equipment
manufactured prior to April 1988, are susceptible to stress
gaging requirements. Ring and gap gaging will be conducted
corrosion cracking, evidenced by surface corrosion. Projectiles
during IRI according to chapter 2 and appropriate drawings
with base corrosion or stress corrosion cracks may
and specifications. Subsequent gaging will only be performed
malfunction inbore. New production bases are of an improved
on those projectiles showing evidence of damage.
aluminum alloy which is less susceptible to stress corrosion
N-4. Inspection category and sampling plan.
cracking. New style bases are identified by black color and by
the projectile's NSN. The improved alloy will be used in new
a. Inspection Category Y, Periodic Inspection interval -
production and replacement bases for all ICM projectiles, both
thin based and remote anti-armor mine system (RAAMS).
Appropriate stock numbers are provided in table N-1.
b. Sampling plan for inspection is according to chapter 2.
N-5. Specific inspection points.
Item will be inspected and classified according to chapter 2
Upper and lower bourrelet
Bourrelet gage failure area
Gage, Feeler, Blade Type
Base and body interface
Fiberglass wrap and