TM-9-6675-262-10
AIMING CIRCLE M2 W/E AND M2A2 W/E
TECHNICAL MANUAL; OPERATOR MANUAL
DECEMBER 2013
TM-9-6675-262-10 - Page 11 of 68
0001-3
INTERGRANULAR: Metal deterioration caused by corrosion on the bonds between or
across the grain boundaries of the metal. The metal will appear to be peeling off in
sheets, flaking, or being pushed apart by layers. A particular type of intergranular
corrosion is exfoliation.
PITTING: This can result from conditions similar to those for crevice corrosion. Pits
can develop on various materials due to their composition. Rifle boxes are big victims
of pitting.
EROSION: Results when a moving fluid (liquid or gas) flows across metal surface,
particularly when solid particles are present in the fluid. Corrosion actually occurs on
the surface of the metal, but the moving fluid washes away the corrosion and exposes
a new metal surface, which also corrodes.
FRETTING: Occurs as a result of small, repetitive movements (e.g., vibration)
between two surfaces in contact with each other.
It’s usually identified by a black
powder corrosion product or pits on the surface.
GALVANIC: Occurs when two different types of metal come in contact with each other,
like steel bolts on aluminum, for example. This is a common problem on aircraft
because of their mix of metals.
STRESS: Term used to describe corrosion cracking and corrosion fatigue.
Where an item is not ready/available due to one of these forms of corrosion, it shall be
recorded as a corrosion failure in the inspection record and the appropriate code (170)
for corrosion shall be used when requesting/performing maintenance.
SF Form 368, Product Quality Deficiency Report should be submitted to the address
specified in DA PAM 750-8, The Army Maintenance Management System (TAMMS)
Users Manual.
NOMENCLATURE CROSS-REFERENCE LIST
COMMON NAME
OFFICIAL NOMENCLATURE
AIMING CIRCLE
SURVEYING SET, FIELD ARTILLERY BATTALION
LIST ABBREVIATIONS / ACRONYMS
ASSY
Assembly
ATTN
Attention
AZ
Azimuth
BII
Basic Issue Item
BOI
Basis of Issue
CAGEC
Commercial and Government Entity Code
COEI
Component of End Item
CONT
Continued
DA
Department of Army
DA PAM
Department of the Army Pamphlet
EA
Each
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