AI-3
MODULAR PACKAGING—Circuit assemblies or subassemblies packaged to be easily removed for
maintenance or repair.
MODULE—A circuit or portion of a circuit packaged as a removable unit. A separable unit in a
packaging scheme displaying regularity of dimensions.
MILITARY STANDARDS (MILSTD)—Standards of performance for components or equipment that
must be met to be acceptable for military systems.
MINIATURE ELECTRONICS—Modules, packages, pcbs, and so forth, composed exclusively of
discrete components.
2M—Miniature/Microminiature repair program.
MONOLITHIC IC—ICs that are formed completely within a semiconductor substrate. Silicon chips.
OFF-LINE TEST EQUIPMENT—Tests andisolates faults in modules or assemblies removed from
systems.
OHMS PER SQUARE—The resistance of any square area of thin film resistive material as measured
between two parallel sides.
ON-LINE TEST EQUIPMENT—Continuously monitors the performance of electronic systems.
ORGANIZATIONAL-LEVEL MAINTENANCE (SM&R Code O)—Responsibility of the user
organization.
PACKAGING LEVELS—System developed to assist maintenance personnel in isolating faults.
PHOTO ETCHING—Chemical process of removing unwanted material in producing printed circuit
boards.
POINT-TO-POINT WIRING—Individual wires run from terminal to terminal to complete a circuit.
PRINTED CIRCUIT BOARD (peb)—The general term for completely processed printed circuit or
printed wiring configurations. It includes single-layered, double-layered, and multi-layered
boards.
SCREENING—Process of applying nonconductive or semiconductive materials to a substrate to form
thick film components.
SHIELDING—Technique designed to minimize internal and external interference.
SOURCE, MAINTENANCE, AND RECOVER-ABILITY CODES (SM&R CODES)—Specify
maintenance level for repair of components or assemblies.
SUBSTRATE—Mounting surface for integrated circuits. May be semiconductor or insulator material
depending on type of IC.
THICK FILM COMPONENTS—Passive circuit components (resistors and capacitors) having a
thickness of 0.001 centimeter.
