MIL-DTL-81929C(AS)
d. Matched parts. When two or more parts that would normally be procured as separate
items have been machined to fit as a matched set or lapped assembly, or have been
matched electronically to meet circuit requirements, the set of items shall be assigned a
separate part number.
e. Contractor standard parts. Contractor standard parts should only be listed when the NIIN
is assigned to the contractor standard part.
f. Government standard parts. Government standard part numbers shall be listed in the
"PART NUMBER" column. The part number shall be complete including prefixes and
suffixes to the basic number. If more than one Government standard part number is
listed on the contractor drawing specification for a single application, the preferred part
number shall be listed.
g. Government standard items containing nonstandard detailed parts. Items covered by
Government standard drawings, that contain repair parts that are not designated by
government detailed designed drawing numbers, shall be listed in organizational level
manuals by the Government standard part number when the NSN is assigned to the
Government standard item.
h. Altered or source-controlled items. If any Government standard or commercial item is
altered, selected, or source controlled because of special fit, tolerance, weight, or
reliability of performance, the part number of the activity responsible for the alteration,
selection, or source control shall appear in the "PART NUMBER" column. Repainting,
reidentifying, or other insignificant operations shall not be considered alterations,
selections, or source controls.
i. Similar assemblies. If right and left, top and bottom, front and rear, or other similar
assemblies contain a majority of identical parts, the IPB for the similar assemblies shall
be combined and identified in the GAPL.
j. Symmetrically opposite parts. Symmetrically opposite parts shall be listed separately
and identified in accordance with the contract drawing specification.
k. Subcontractor or vendor items. Subcontractor or vendor items are defined as items that
are used by the manufacturer of the item covered by the IPB exactly as produced by a
subcontractor or vendor. Repainting, reidentifying, or other insignificant operations shall
not be considered alterations, selections, or source controls. When subcontractor or
vendor items are assigned an NIIN, the item part number shall be listed in the "PART
NUMBER" column.
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