MIL-DTL-81929C(AS)
3.4.1.8 Index numbers. Index numbers, with leader lines to the parts to which they pertain,
shall be used on all illustrations. Index numbers shall be assigned in accordance with 3.6.1.8.1.
The index numbers on each illustration shall agree with those in the parts listing.
3.4.1.8.1 Assignment of index numbers. Index numbers shall be assigned to all parts listed in
the GAPL that have maintenance or supply significance, except as otherwise noted herein. Index
numbers shall be first assigned to the parts list and then applied to the illustration to maintain the
proper sequence in the breakdown. If the same part number is listed more than once in the
breakdown, it may be assigned a different index number for each listing. No index number shall
be assigned to an assembly when all detail parts are indexed, unless such assembly is also
illustrated completely assembled on the illustration. Illustrations shall be reindexed, as required,
when parts are added or deleted from the parts list, except as follows:
a. Added parts may be assigned letter-suffixed index numbers, e.g., 2A, 2B, 2C, when
additional information or corrections must be inserted late in preparation and
renumbering of index numbers would delay submittal.
b. During a revision to the manual, if an IPB figure has not otherwise been affected,e.g., no
technical content change is required, the illustration and tabular data shall not be
reindexed to eliminate previously added suffixed index numbers. In a revision that
affects 80 percent or more of the total accumulated changed pages, the data shall be
reindexed.
c. When the technical content change is a minor correction to either the illustration or
tabular data, the figure shall not be reindexed.
3.4.1.8.2 Attaching parts. Each part in a set of attaching parts (such as bolt, washer, nut)
shall be assigned an index number. However, also see 3.4.1.8.3. Sets of attaching parts shall be
exploded when the assembly is hidden and sufficiently complex to merit explosion. If the
attaching parts are not visible on the illustration, and their location is obvious, multiple index
numbers that identify the principle item and its attaching parts may be assigned and an exploded
view is not required.
3.4.1.8.3 Indexing of duplicate items. The total quantity of each item listed in the GAPL shall
be identified with index numbers in the illustration. To avoid cluttering an illustration with
unnecessary index numbers, large quantity items need not be indexed more than once on the
illustration or on each sheet of a multisheet illustration that the part is shown. However, the
location of the items must be obvious in the illustration. For example, multiple size rivets that are
shown in various locations on the illustration need only be indexed once for each part number
listed in the parts list.
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