MIL-DTL-81218C(AS)
a procedure (step) states "if outside of limits, go to step x," the procedure shall also direct "go to
step y" if within limits.
3.5.14 Major assembly/subassembly maintenance. Maintenance of sections or modules (such
as front frame, compressor, and turbine) and major subassemblies (such as gearboxes) shall be
covered in separate WPs for each section, module, or subassembly. These WPs shall include
procedures and illustrations for disassembly, cleaning, inspection, repair, and assembly.
Application and operation of support equipment shall be described as they are required during
maintenance and illustrated when necessary. Instructions shall specify use of approved corrosion
preventive compounds, neutralization, or other protection on parts and components.
3.5.14.1 Disassembly. Instructions shall include sequential procedures for disassembly of
sections, modules and subassemblies into component parts. Disassembly of component parts shall
be covered only to the extent required for the authorized level of maintenance. Precautions to be
observed and critical dimensions to be recorded shall be included.
3.5.14.2 Cleaning. Specific instructions for parts and subassemblies and cleaning methods
such as special agents, ultrasonic, and compressed air not covered in general manuals or the
standard practices WP shall be included. References to these documents shall be made, as
necessary. Precautions to be observed during cleaning shall be specified. Instructions relating to
preservation of metal parts and surface treatment after cleaning shall be included.
3.5.14.3 Inspection. Procedures shall include the required inspection methods, support
equipment, and instructions for inspection of engine parts within the scope of the applicable level
of maintenance. Inspection instructions shall encompass failure, wear, damage, corrosion,
leakage, aging, burning, malfunctioning, deformation, and deterioration that can be expected to
occur during service of the engine. Allowable service limits and adequate standards for
determining when parts should be repaired or replaced shall be included. Illustrations shall be
prepared whenever necessary to augment inspection tables and shall be (index) numbered to
correlate table(s) to figure(s). Procedures shall be included for performing special inspections
required when the engine has operated beyond permissible limits, such as overspeed,
overtemperature, or sudden stop. Requirements for special inspection by nondestructive methods
shall be specified.
3.5.14.4 Repair. Comprehensive instructions shall be included for necessary repair to restore
the engine section, module, or major subassembly to a completely satisfactory condition. Repair
methods shall be specified for the correction of all deficiencies and conditions considered
repairable within the scope of the level of maintenance to which the manual applies. Specific data
shall be included to adequately describe repairs, including material specifications for metals when
pertinent to making repairs.
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