MIL-DTL-81218C(AS)
j. Major assembly/subassembly maintenance (disassembly, cleaning, inspection, repair and
assembly of subassemblies)
k. Engine maintenance (fuel systems, lubrication system, electrical system, bleed air system
and other engine systems)
1. Support equipment maintenance
3.4 Technical content - general. Except where noted for specific application, or restricted
from use in a specific application, the following guidelines apply to all maintenance manuals
prepared to this specification.
3.4.1 Technical content requirements. Instructions prepared in accordance with this
specification shall follow the approved maintenance plan/logistics support analysis and spare parts
provisioning documentation applicable to the engine or equipment covered. Data shall be based
on sound engineering principles and techniques, service experience, performance data, and
available reliability data. Standard shop practices and techniques contained in general
maintenance engineering series manuals shall not be duplicated. When applicable, appropriate
reference shall be made to these manuals in accordance with MIL-DTL-81927 (see 3.1.4).
3.4.2 Maintenance level. Procedures shall be specifically tailored to the level of maintenance
to which the manual applies. Intermediate maintenance manuals shall include coverage only to the
extent of repair authorized at the intermediate level, and depot maintenance manuals shall contain
complete rework instructions. When both intermediate and depot level engine maintenance
coverage is specified, depot information normally shall not duplicate intermediate coverage but
shall be limited to necessary supplementary depot maintenance information; appropriate reference
from the depot manual to the intermediate manual and WP number shall be included.
3.4.2.1 Depot level. Depot level maintenance manuals shall include instructions and
procedures that will permit repair of engine sections, modules, subassemblies, and accessories to
the authorized depth contained in the maintenance plan. The extent of coverage required in depot
level manuals will vary depending on the type of maintenance at the intermediate level. For
example, if intermediate level maintenance is performed horizontally and the depot level
maintenance is accomplished vertically, an extensive depot manual may be required.
3.4.2.2 Combined intermediate-depot maintenance. Where authorized by the requiring
activity, a combined intermediate depot maintenance manual shall be prepared. If the differences
between intermediate level procedures and depot level procedures for a particular section,
module, subassembly, accessory, or function are minor, the procedures should be covered in the
same WP(s). The WP title page(s) shall identify the combined coverage. The procedures
applicable to depot level maintenance shall be appropriately identified; the manual introduction
shall explain the method of identifying these procedures. If the differences between the
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