MIL-DTL-38769E
3.2.5.1 Type maintenance code. This list shall include only those codes that are applicable to the
equipment covered by the WUC manual (see 6.4.1). The following note shall be included in all WUC
manuals following the type maintenance codes:
NOTE: Refer to TO 00-06 series TOs for off-equipment and shop Type Maintenance codes.
3.2.5.2 Action taken code. The complete list of action taken codes shall be included in the manual (see 6.4.2).
3.2.5.3 When discovered code. Only the when discovered codes and deinitions, for the equipment to which
the WUC manual is applicable, shall be included in the manual (see 6.4.3).
3.2.5.4 How malfunction code (HMC). The HMC shall be listed in both alphabetic and numeric
sequence, and shall contain only those codes that are applicable to the speciic equipment contained in
the WUC manual (see 6.4.4).
3.2.5.4.1 Alphabetic and numeric sequence. The alphabetic and numeric sequence shall be further divided
into four categories: avionics/electrical/computer; physical/mechanical; engine related; and no defect.
3.2.5.4.2 Engine related HMCs. Engine related HMCs are restricted and shall be further divided into ive
categories: observed or recorded operational conditions; identiied components; condition monitoring; chance
occurrences; and managerial decision. These codes shall be used for engine related items (see 6.4.4.1).
3.2.5.4.3 Restricted uses of HMC. The following note shall immediately precede the alphabetical
listing of HMC:
NOTE: Technicians must use a How Malfunctioned Code (HMC) from the engine related codes
when documenting the removal of engines or engine components that are AFI 20-115 reportable.
For all other maintenance actions, on any type of equipment, there are no restrictions on the use of
codes by category. If a code is appropriate for an observed malfunction, it may be used regardless
of the category in which it is listed. Avionics shops may use engine codes. Engine shops may use
avionics codes. Tire shops may use physical/mechanical, avionic, or engine codes, etc. Categories of
codes were created primarily for ease in inding a speciic code.
3.2.6 Support general codes. (See 6.5).
3.2.7 Unique data codes for MCS. Print Presentation: These codes shall be included in the WUC manual
following the last page of support general codes. For two-chapter and three-chapter manuals they shall be
printed on one page and it shall be numbered 05-001 (see 6.6). The standard WUC manual shall have the
unique data codes printed on one page, and it shall be numbered XII-001.
Electronic Presentation: The unique data codes shall be placed in their own data portion.
3.2.8 Work unit code. (See 6.7). Construction and application of WUCs shall be in accordance with
Appendix A.
3.2.8.1 Used with but not part of. Work Unit Codes for these items shall be included (see 6.11).
3.2.9 Nomenclature. Each WUC in the equipment identiication listing shall relect the information required
to properly identify all levels of assembly, and shall include the basic noun for each individual item that is
coded. If an oficial military type nomenclature has been assigned, it shall be used for identiication. Part
numbers may be used to identify items, if no oficial nomenclature exists. The basic part number only shall
be used, (i.e., 47A102212-XX rather than 47A102212-05). Abbreviations may be used when necessary,
if approved by the acquiring activity (see 6.2f.).
3.2.10 Time change, conigured article, serially controlled, and warranty tracked items.
3.2.10.1 Two-chapter and three-chapter WUC manual. Time change, time signiicant, conigured article,
serially controlled, and warranty tracked items shall be denoted by use of capital "T," "C," "S," and
"W," respectively, in parentheses, inserted between the WUC and its deinition (nomenclature) (i.e.,
99ABC (T) Ignitor (time change); 99DEF (C) Stator (conigured article); 99TUV (S) Housing (serially
controlled); 99XYZ (W) Ampliier (warranty tracked)). These symbols may also be used in combinations,
except "S" shall not be used with "C" or "W" (see 6.12). An explanation shall be provided in the
manual foreword (see 2.1 of Figure 4).
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