MIL-DTL-24784/12B(SH)
1.
Tag-out the power to the controller.
2.
Open the access door to controller.
3.
Test with voltage tester to ensure power supplies are de-energized.
4.
Remove arc chutes, where applicable. Examine for carbonizing. Scrape clean or renew
as necessary.
5. Examine all contacts. If main line contacts are rough, burned, or pitted, dress with
sandpaper or contact dressing file.
6. Vacuum inside of panel; use dusting brush to loosen dirt, wipe components with a rag.
7. Examine components and wiring for evidence of overheating. Refer to wiring harness
replacement procedures in Chapter 6 if wiring has been overheated.
Corrective maintenance required as a result of any preventive maintenance inspection shall be
included in Chapter 6 and referred herein - Corrective maintenance (see 3.6.7).
3.6.5.4 Overhaul maintenance and repair standards. These standards shall provide a schedule
and procedure in correlation with Chapter 6, section 2, repairs for the detailed overhaul
maintenance and repair including:
a. Pre-overhaul performance, hydrostatic, or other evaluation tests.
b. Pre-overhaul and maintenance inspections GO or NO-GO acceptance and rejection criteria for
wear, dimensions, clearances, surface finishes, electrical resistances, alignments, backlash, play,
vibrations, noise, aging, corrosion, erosion, (or other standards of acceptance, as appropriate)
for each applicable part. Criteria shall be predicated on the need for satisfactory performance
with no more than routine maintenance until the next similar inspection. Calibration
requirements for special tools and instruments.
c. List of items which should be replaced and those which should be available for replacement if
inspection so indicates. (Provide guidance on comparative suitability of worn-in parts versus
new parts, wherever appropriate.)
d. Detailed disassembly procedures.
e. Procedures for reconditioning reusable parts and subassemblies before reassembly.
f. Critical inspection and review procedures for new parts (including comparison with parts
being replaced to establish equivalence before installation).
g. Critical operations and checks during reassembly.
h. Quality assurance and post-overhaul (or maintenance) tests and examinations to ensure
suitability (including method of testing and run-in operations where required).
3.6.6 Chapter 5, Troubleshooting. Troubleshooting procedures and data shall contain all
information necessary for a technician to locate a malfunction in the equipment. Troubleshooting
shall be presented based on locating potential faults in a unit, assembly, subassembly module, or
piece part, depending on the maintenance concept (see 6.4.4) for the level of maintenance being
performed. When the troubleshooting concept limits the location of a fault to a repairable item
(such as the unit, assembly, subassembly or module) for organizational level maintenance,
troubleshooting procedures and data shall also be presented that will permit a repair of the item at
the intermediate- or depot-level maintenance facility, except when this information is included in
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