MIL-DTL-24784/12B(SH)
a. Column 1, Periodicity. This column shall contain an alphanumeric list of all maintenance
actions contained in the chapter. The following periodicity symbols, as appropriate, shall be
used in the order of increasing periodicity as listed in Table I.
TABLE I. Periodicity symbols.
INTERVAL
SYMBOLS
Daily
D
Weekly
W
Monthly
M
Quarterly (3 months)
Q
Semiannually (6 months)
S
Annually
A
Overhaul cycle
C
As specified (explain circumstances)
R (see note 1)
1. An R periodicity shall be preceded by a recommended calendar periodicity (for example,
DR, WR, MR, and so forth).
b. Column 2, Maintenance action. This column shall list the maintenance action which
corresponds to the periodicity number in column 1.
c. Column 3, Reference. This column shall state the paragraph number that contains the
procedure listed in column 2.
3.6.5.3 Schedule. The plan for maintenance shall set forth a time schedule of all maintenance
actions (examinations, tests, adjustments, reconditioning, overhaul, and acceptance criteria) which
should be taken, all parts which should be replaced, and all other parts which should be available
to allow replacement if examination so indicates over the life cycle of the ship. The procedures
shall provide detailed maintenance and overhaul procedures at all maintenance levels
(organizational, intermediate, or depot) to provide for the reconditioning or replacement of each
part subject to continuing degradation, before the degradation results in major failure. It shall
specify in detail the examination measurements, tolerances, work, tests, and quality assurance
operations required to provide satisfactory maintenance and overhaul. Each task for the
continuing shipboard preventive maintenance schedule shall be in the following format:
a.
Subcomponent (such as "motor controller").
b.
Frequency and periodicity [such as "semiannually" (see 3.6.5.2)].
c.
Related maintenance (such as "take insulation resistance readings").
d.
Maintenance task description (such as "clean and examine controller").
e.
Safety precautions (such as "WARNING Controller operates at high voltages to prevent a
personnel casualty, use ship's "tag-out" procedures to ensure that the controller remains de-
energized throughout task").
f. Tools, parts, materials, test equipment (such as "lint-free rag", "six-inch screwdriver" and
"vacuum cleaner with nonmetallic nozzle").
g. Procedure - List a detailed step-by-step procedure such as:
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