MIL-DTL-38769E
APPENDIX A
A.3.3.1 Munitions work unit code breakout. Munition items of a complex nature, and support equipment
(SE) peculiar to nuclear munitions, will be coded as individual end items utilizing major assembly,
subassembly/mod number, and component breakout. All other munitions, components, etc., will be
homogeneously grouped and coded as major assemblies of a speciic group.
A.3.3.2 Mission, design, and series (MDS). Work unit code manuals will be prepared to cover each
basic mission and design aircraft, missile, or spacecraft. System code manuals will be prepared by
individual series, if speciied by the acquiring activity (see 6.2k.). This will require that the AFMC Air
Logistics Complexes Single Manager (SM) ensure that a standard reporting designator is assigned for that
speciic mission, design, and series in TO 00-20-2.
A.3.3.3 Trainer application. Class trainers, mobile training sets, and resident training equipment will not be
coded in the training equipment WUC manuals. Class III training equipment does not require detailed
WUCs; one code is presently assigned for recording production credit on Class III trainers. The criteria for
establishing WUCs for Class I training equipment is as follows: There must be ive or more trainers in the
inventory, or ive or more trainers programmed for the inventory within the next iscal year, from time
of determination. They will be of suficient cost or complexity to warrant detailed data analysis. This
determination will not be predicated on cost alone.
A.3.4 Level of detail for each functional system. The WUCs for each functional system/homogeneous group
will cover each reparable item in the functional system/homogeneous group, as speciied by the applicable
source document (see A.3.5). Work unit codes will also be assigned to nonrepairable components, if they are
known or suspected to be vital to successful system operation, or to be signiicant maintenance hour
consumers. These items will have a WUC assigned in order to report those critical "on-equipment" actions
for reliability and maintainability evaluation purposes. In some cases it may be necessary to arbitrarily assign
"interface" type items of equipment (i.e., interface connectors, tubing, couplings, wire, etc.) to a functional
system. These decisions will be made after primary consideration is given to the maintenance responsibilities
and training of the technicians who are required to maintain the interface items of equipment. For example,
if a piece of tubing, with a regulator attached, makes the interface between the pneumatic and engine
systems, and the engine technician is responsible for adjustments and maintenance of the regulator, then the
tubing and associated regulator will be assigned to the engine functional subsystem.
A.3.5 Source data. Systems engineering data (i.e., engineering analysis data, equipment maintenance
analysis data, and contract end item detail speciications) will be used as source data for WUC assignment.
Maximum correlation between the component content of a contract end item and the assignment and
grouping of WUCs is desirable. When available concurrently with the WUC manual preparation, illustrated
parts breakdown technical manuals will be used as source data in determining level of assembly.
A.3.6 Reserving codes for future use. The capability to ensure that new codes can be assigned for future
modiications or additions of equipment will be designed into each code manual in the third, fourth, and
ifth positions of the WUC. If expansion capability is designed into the original codes, new equipment can
be added without disturbing the original codes. Minimum code changes are essential to prevent loss of
identity for previously complied maintenance data.
A.3.7 Reuse of codes. When existing WUCs are deleted from a manual, they will not be reassigned
for a minimum of ninety days following their deletion, nor without prior approval of the acquiring
activity. If there is no other code, or code sequence, that can be used, WUCs may be reassigned by
the acquiring activity without waiting ninety days.
A.3.8 Work unit code construction.
A.3.8.1 Alphabetic and numeric codes. Upper-case letters A through Z (excluding I and O) and numbers 0
through 9 will be utilized for WUC assignments as speciied in subsequent paragraphs. The letters I and O
will not be used in any WUC to prevent confusion with the numbers one and zero.
A.3.8.2 End item code construction. The irst two characters of the WUC are alphabetic or numeric, and
identify the end item of equipment. These characters are assigned by Tables I thru VII, and controlled by
the acquiring activity. No deviations are authorized without prior approval by the acquiring activity.
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