MIL-DTL-81218C(AS)
b. Expendable materials. The expendable materials shall be listed alphabetically by
nomenclature, specification or part number, quantity, and shall reference those WPs in
which used.
3.5.5 Description and principles of operation. This coverage, which is used by maintenance
personnel to further understanding of the engine, shall include but not be limited to basic engine
description, and description of each related system. This information on the engine and its
systems shall include purpose, type, series, main features, and a table of leading particulars
including dimensions, weight, and other basic engine data. If more than one model is covered, the
significant differences shall be explained.
3.5.5.1 Principles of operation. A complete explanation of the operation of the engine and its
systems shall be included. Basic theory found in textbooks shall not be included. Information
such as cylinder numbering, compressor stages, combustion chamber arrangement, location of
major sections, modules, components, and accessories shall be presented. The principles of
operation shall consist of functional narrative written to facilitate understanding of the engine
systems to the extent necessary to support fault detection and isolation and maintenance of the
systems. This text shall describe system operation and the relationship of other
systems/components during system integration Functional block diagrams and schematics shall
be used to support the text.
3.5.6 Standard practices. This coverage may be separate WP and shall contain standard
cleaning processes, inspection, and repair procedures, plating, welding, and other general
information not contained in a separate manual. Practices and procedures that are peculiar to
assemblies, subassemblies, components and accessories shall not be included in this coverage.
Reference shall be made to the standard practice WP from maintenance WPs where applicable.
3.5.7 Engine handling. The coverage shall include handling instructions for engine removal
from and installation in the shipping container and maintenance stand. The coverage shall also
include instructions for transferring an engine to and from a transport trailer and use of a standard
Navy rail system.
3.5.8 Preparation for use, storage, and shipment. These instructions shall include unpacking
the engine, depreservation, preoiling, preparation for initial run, preservation, packing, and
storage. In addition, this WP shall include the overall dimensions and weight of shipping and
storage containers with the engine, engine sections, modules, or components packed in them.
Information shall be included for corrosion control in the form of prevention, recognition, and
elimination procedures. Instructions shall also be included for short-time storage at the
intermediate level. Specific instructions shall be included for the engine and equipment concerned
and shall not duplicate information provided in general series manuals, which shall be referenced
as applicable.
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