when an assembly or part was installed during modification, and the original does not have continued application, only the
preferred item is listed. Interchangeable and substitute assemblies and parts, subsequently authorized by the Government,
are not listed in this manual; such items are identified by information available through the Interchangeable and Substitute
(I& S) Data Systems. Refer to T.O. 00-25-184.
1-11. FEDERAL SUPPLY CODE FOR MANUFACTURERS (FSCM). The FSCM identifies the manufacturer or
Government agency whose number appears in the Part Number column. When an FSCM does not appear in the current
issue of H4-1, H4-2, or H4-3 Cataloging Handbooks, the word "None" will appear in the FSCM column and the name and
address of the manufacturer or Government agency will be shown in parentheses following the item description. See table
1-1 for FSCM information.
1-12. DESCRIPTION. This column contains the approval item name for each part and distinguishing modifiers, where
applicable. The Maintenance Parts List is indented to indicate item relationship. Indention is indicated by leader points or
period, one point or period signifying one indention. When the nomenclature exceeds a single line presentation, the
second or following lines are indented two additional indents from the first line. The term "NHA" (Next Higher Assembly)
indicates the assembly of the item from which reference is made. Texas Instruments Incorporated Equipment Group
specification control numbers parenthetically follow the description where applicable.. When the word "None" appears in
the FSCM column, the name and address of the manufacturer or Government agency parenthetically follows the
Example of indention procedure:
1 2 3 4 5 6 7 Description
Article, Main group, or Main assembly
.Attaching parts for assembly (AP)
..Detail parts for assembly
..Attaching parts for subassemblies (AP)
...Detail parts for subassemblies
...Attaching parts for sub-subassemblies (AP)
....Detail parts for sub-subassemblies
1-13. UNITS PER ASSEMBLY. Shown in this column is the number of units required per assembly, per subassembly,
and per sub-subassembly, as applicable. If more than one assembly is required, the total number of such assemblies is
shown. For detail or subassembly parts of an assembly, the quantity required for one assembly is shown. The unit of
measure is "each" unless otherwise specified in the description column. The notation "REF" in the Units Per Assembly
column indicates that the quantity of the referenced assembly at any one location can be determined by referring to the
next higher assembly figure number which parenthetically follows the nomenclature of the item.
1-14. ATTACHING PARTS. Attaching parts are listed immediately beneath the item to be attached and preceding any
detail parts of the item. Identification of attaching parts is by the parenthetic code (AP) following the description of the part.
Attaching parts are listed at the same indention as the part they attach.
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