MIL-DTL-24784 / 21B (SH)
3.6.5.3 Preventive maintenance procedures. These procedures shall include information
required to examine, clean, and lubricate the equipment, and shall contain:
a. Safety precautions.
b. Tools, parts, materials, and test equipment.
c. Cleaning solvents. Solvents shall be identified by Government specification numbers and
National stock numbers.
d. Instructions for properly maintaining all safety devices and interlocks with dangers, warnings,
and cautions.
e. Instructions for lubrication at shipboard operating temperatures; also types and quantities of
lubricants to be applied. Lubricants shall be identified by Government specification numbers
and National Stock Numbers (NSNs). Specific lubricants for arctic or tropic environments
shall be included. When a proprietary lubricant is approved, a Government Specification
lubricant shall be listed as an emergency substitute.
f. The minimum rating of the technician who can be expected to perform the task.
g. Procedures of obtaining access to subassemblies of subcomponents.
h. Instructions for in-place balancing and noise reduction.
i. Inspection procedures for parts which deteriorate due to cycles of use, age, or climatic
conditions.
j. Illustrations to identify lubrication points and other pertinent data.
k. Other information pertinent to these procedures.
3.6.5.4 Scheduled performance tests. These tests shall contain step-by-step procedures
necessary to verify that the equipment is operating within standards in all modes of operation and
shall contain the following:
a. Safety precautions.
b. A list of tools and test equipment identified by type, manufacturer, and model number.
c. The title of the test to be performed.
d. The minimum rating of the technician expected to perform the task.
e. Preliminary setup data required to perform the test.
f. Detailed procedures for accomplishing the test. Procedures requiring lengthy and identical
setup data may be presented in detail in one procedure and referenced in succeeding
procedures.
g. Values or conditions, with tolerances, indicative of normal operation.
h. References to troubleshooting or corrective actions to be used if the test values are not within
tolerances.
i. Illustrations to support the test.
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 faults in a unit, assembly, subassembly, module, or piece part,
depending on the maintenance concept 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
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