MIL-DTL-24784/7C(NAVY)
(12) Switches, transformers, relays, and other electronic or electrical components. Electrical and
mechanical characteristics.
3.9.3 Chapter 3 - planned overhaul and repair maintenance.
3.9.3.1 Planned overhaul and repair requirements. Planned overhaul and repair requirements delineated in
scope to appropriate level of maintenance shall be specified (see 6.2). These requirements shall include cleaning,
refurbishing, and replacement of parts. By planned overhaul or repair work, it is intended to mean the minimum
maintenance work for the system, equipment, or compound regardless of condition. These requirements shall be
delineated to reflect the extent of maintenance to be performed by specific levels of maintenance such as designated
overhaul activity and specialized overhaul activity (DOA/SOA), and designated repair activity and tender repair.
Illustrations, diagrams and other presentation styles shall be in accordance with MIL-DTL-24784. Such
requirements are not dependent on data obtained from pre-overhaul and repair examination and tests. The
requirements shall be determined by application of engineering judgment and consideration of the following:
a.
Review of the design.
b.
Service of the item.
c.
Past experience.
d.
Performance requirements.
e.
Tradeoff in cost and reliability between individual part replacement versus part refurbishment.
3.9.3.2 Disassembly instructions. General disassembly instructions should normally suffice except in cases
when certain detailed disassembly procedures are required to prevent damage to critical components or when
personnel safety may be jeopardized. In these cases, disassembly procedures and limits shall be specified to the
degree appropriate to the level of maintenance. When disassembly instructions are given correctly in technical
manuals, the manuals may be referenced if instructions are lengthy and require the manual to ensure clarity and
comprehension. When examinations, inspections, and tests shall be performed prior to or during disassembly, the
TRS shall so specify. QATIPs hold points shall be specified. Detailed disassembly instructions apply to actions
required for both planned and corrective overhaul and repair maintenance.
3.9.3.3 Planned overhaul and repair material lists. Planned overhaul and repair material lists shall be included
(see figure 1 and 6.2). These lists shall identify those parts which are specifically required to be replaced regardless
of their condition. Selected materials shall be on hand at the appropriate maintenance level activities to accomplish
the planned maintenance actions in accordance with the TRS. These material lists, depending upon extent, may
either be contained in the body of the TRS or placed in an appendix and referred to in the body of the TRS. No
direct or indirect citation of the actual failure rate of any part is allowed. Technical manuals shall not list or cite any
figures of merit for the reliability or maintainability of the equipment (or parts) at any level of indenture.
3.9.3.4 Contingency material list. Contingency material lists shall be included (see figure 2). These lists shall
identify those parts based on engineering analysis or experience, delineated with respect to levels of maintenance,
which may be expected to require some replacement. It shall be stated that the contingency material lists are
provided so that the maintenance activity will have the necessary material on hand if required. It is not intended to
make the acquisition of such material mandatory. Contingency material lists may be either contained in the TRS
body or placed in an appendix and referred to in the body of the TRS.
3.9.3.5 Criteria for suitability of worn-in parts versus new parts. Criteria shall be provided by which the
overhauling activity determines whether worn or degraded parts are suitable for continued use until the next similar
overhaul or repair period. The criteria shall explicitly state those measurable, wear or deterioration limits which, if
exceeded, require replacement by new parts.
3.9.3.6 Receipt inspection of new or refurbished parts. Procedures shall be included for the critical inspection
and review of new parts and of overhauled and repaired parts received from DOA/SOA activities (including their
comparison with parts being replaced to establish equivalency before installation).
3.9.4 Chapter 4 - reassembly and grooming. Paragraphs in this chapter shall:
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