MIL-DTL-24784 / 21B (SH)
a.
Introduction.
b.
Scheduled maintenance action index.
c.
Preventive maintenance procedures.
d.
Scheduled performance tests.
When a separate depot-level manual is required (see 6.2), it shall include the information required
by MIL-DTL-24784 and MIL-DTL-24784/7 as applicable.
3.6.5.1 Introduction. The introduction shall be an explanation of the purpose, scope, and
arrangement of the scheduled maintenance data. When a preventive maintenance procedure is
critical to the operation of the equipment and the schedule for servicing is absolute this
information shall be conspicuously written as a caution. The following applicability statement
shall be included:
"The scheduled maintenance instructions in this manual are intended to duplicate those
furnished in the Planned Maintenance Systems (PMS). In case of conflicts, the PMS
documentation takes precedence. Such conflicts should be reported immediately on the
user comment sheet in accordance with the maintenance procedures for this manual."
3.6.5.2 Scheduled maintenance action index. This index shall include all scheduled performance
procedures. The index shall be tests and preventive maintenance tabulated as follows:
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 II.
TABLE II. 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 (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.
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