MIL-DTL-38769E
APPENDIX A
WORK UNIT CODE CONSTRUCTION/APPLICATION
A.1 SCOPE.
A.1.1 Scope. The Work Unit Code consists of ive characters, and is used to identify the system,
subsystem, and component on which maintenance is required, or on which maintenance was accomplished.
This appendix provides instructions for construction and application of WUCs. This appendix is a mandatory
part of the speciication. The information contained herein is intended for compliance.
A.2 APPLICABLE DOCUMENTS.
A.2.1 Government documents. The following document forms a part of this appendix to the extent
speciied herein.
Technical Order
TO 2J-1-24
Equipment Comprising a Complete Basic Gas Turbine Engine
A.3 WORK UNIT CODE APPLICATION AND CONSTRUCTION
A.3.1 Application of work unit codes. The primary purpose of WUCs is to identify the hardware on which
work has been accomplished, and the relationship of hardware within a major assembly, subassembly,
etc. Work unit codes will not be assigned to locations, general terms, or homogeneous group titles. For
instance, station numbers, geographic locations, and terms such as mechanical components or miscellaneous
equipment may be used as a title to aid in locating WUCs within the code manual, but these titles will
not have WUCs assigned. Work unit codes will not be assigned to common hardware or soft goods,
such as nuts, bolts, washers, clamps, seals, packing, and O-rings. Work on these type items is normally
reported against the coded assembly on which the item is attached.
A.3.2 Work unit code - equipment identiication. This is a ive position code which identiies the end item,
major assembly, subassembly, or component that requires maintenance. The irst two positions of the
WUC will be assigned in accordance with Tables I through VII, and controlled by the acquiring activity,
to identify the end item of equipment. The third and fourth characters include major assemblies and
subassemblies, and identify irst and second levels of assembly. The ifth position of the WUC includes
reparable/recoverable components, and identiies the lowest level of assembly below the end items.
A.3.2.1 Support general codes. Support general codes are for recording production credit of repetitive tasks
of a general nature, and are not used for recording malfunctions, repair, Not Repairable This Station (NRTS),
or condemnation actions. The multitude of tasks, which must be accomplished, precludes listing them all in
the support general tables (Table VIII and IX) provided. This is not intended to restrict documentation of
tasks. All support general work must be identiied to the most appropriate code. Support general code tasks,
not applicable to the equipment being coded, will not be included in the manual.
A.3.2.2 Scheduled and special inspections. Support general codes, for scheduled and special inspections,
will be selected from Tables X through XVIII, as applicable. Use of the assigned codes without change
is mandatory. Changes and additions must be approved by HQ AFMC/SCXR prior to including them
in the manual. Scheduled and special inspection codes, not applicable to the equipment being coded,
will not be included in the manual.
A.3.3 Functional system concept. The functional system concept will be used for equipment breakout. A
functional system will consist of those units which make up a system without regard to whether the units
are hydraulic, electrical, pneumatic, electronic, or mechanical in nature. The components which comprise a
functional system will be those components which contribute to the actual function or activation of the system.
For example, the components which supply the hydraulic or pneumatic source of power will be included
under System 14, "Flight Controls" which is a functional system. As another example, light reference
instruments, free air temperature, and similar instruments will be included in System 51, "Instruments,";
whereas position indicators, temperature or pressure sensing, and autopilot instruments will be included under
the system that they function with, such as System 52, "Autopilot." The only exception to this rule is
System 97, which will include all explosive devices regardless of the system with which they are associated.
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