MIL-DTL-24784/18B (SH)
terms, preferably including an approximate equivalent expressed in a simpler form. Mathematics
shall not be used to justify design or to describe basic circuit elements.
3.6.5 Chapter 4, Scheduled maintenance. It is intended that the engineering effort required to
develop preventive maintenance data be expended only once and that the data, where applicable
be used both in this chapter and in Logistic Support Analysis (LSA) or maintenance requirements
cards (MRC) where one or more of the latter three data items are required by the contract (see
6.2) The preparation of this chapter of the manual should therefore be delayed until completion of
the, LSA or MRC; submissions of the manual draft copy for review should be marked "TO BE
SUPPLIED UPON COMPLETION OF LSA". When the approved LSA, or MRC data is
available, it shall be included in the manual in the identical technical content and, wherever
practicable, in the identical format. When included in the manual, such, LSA, or MRC data shall
be integrated with other technical data required by this specification to be in this chapter. The
manual as delivered shall reflect the detailed maintenance requirements of the completed MRCs.
This chapter shall contain preventive maintenance procedures and performance test instructions to
be accomplished on a scheduled or condition monitoring basis. When an MRC or a reference
standards book is available or prepared under the same contract, this information may be
duplicated in the technical manual without change in format. These procedures shall be correlated
with the installation checkout requirements of 3.6.9.9 such that any maintenance or performance
test procedure also required for checkout may be properly referenced from Chapter 8,
Installation. The Installation Standards Summary Sheet (see 3.6.9.9.3.2) shall also include space
for any maintenance or performance standard test result that should be recorded by the installer.
The recorded information shall provide a reference standard to the Navy technician when
troubleshooting or when needed for installation acceptance certification or for certifying proper
overhaul.
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 (not just
recommended), 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 I.
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