MIL-DTL-24784/20B (SH)
principles of operations of the overall equipment and its functions. The required inputs and
development of the equipment outputs in every mode of operation shall be described. The
descriptions shall be presented in successive levels of increasing detail as follows:
a. Overall level (Level 1). The first level of description shall explain the equipment functions in
terms directly related to the equipment primary FBD (see 3.5.1.1b). The primary FBD and
associated keyed text (see 3.6.4.5) are located in section 2.
b. Detailed level (Level 2). The detailed level description shall explain the equipment functions
in terms directly related to the secondary and lower level FBDs and FCDs (see 3.5.1.1b). The
FBDs and associated keyed text (see 3.6.4.5) are located in section 2. The FCDs are located
in section 3.
3.6.9.3 Section 3, 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, trouble- shooting
procedures and data shall also be presented that will permit a repair of the item at the intermediate
level maintenance facility. When more than one level of maintenance must be provided for,
organizational- and intermediate-level troubleshooting procedures shall be separated such that the
organizational-level troubleshooting procedures are identified as "Organizational-Level
Troubleshooting Procedures" and are presented first. Intermediate-level troubleshooting
procedures shall follow organizational-level procedures and shall be identified "Intermediate Level
Procedures." Immediately following this title the following statement shall be included: "These
procedures are authorized for Intermediate-Level (or higher) activities (tender, shore facility or
depot)."
3.6.9.3.1 Trouble isolation and testing. This subsection shall contain all instructions and
information necessary to locate troubles and conduct tests on each component, assembly, or
subassembly of the equipment as follows:
a. Troubleshooting guides providing step-by-step procedures for logical isolation of faults. This
information shall direct the technician to observe meters, fuses, circuit breakers, valves, and
other available indicators which would indicate the presence of trouble.
b. Complete instructions on signal tracing for electrical circuit including the use of special test
instruments and unusual servicing techniques.
c. Where appropriate because of equipment complexity, troubleshooting diagrams including
schematics giving details of mechanical and electrical assemblies and relationship specified
under the following paragraphs.
3.6.9.3.2 Malfunctions. This subsection shall contain all the information required to enable the
technician to locate malfunctions in the equipment.
3.6.9.3.3 Introduction. The introduction shall explain the approach and logic of the
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