MIL-M-81273/1A(WP)
in the diagnosis of a fault not explic-
covered in a single physio-functional
itly covered in any troubleshooting
treatment.
information in the manual.
3.3.1 Functioml Description. The
3.3.1.3 Audience Consideration.
following paragraphs enumerate the
The functional description is written
requirements for preparation of
primarily for the maintenance tech-
functional descriptions.
nician and, in some cases, the as-
3.3.1.1 Purpose. The functional
sembly and test personnel. In ad-
dition, the functional description is
description is intended to present
used widely for orientation of new
an overall operational sequence of
personnel.
the equipment and to show the func-
tional relationship between major
3.3.1.4 Approach. Functional in-
components or units.
formation shall be presented and
3.3.1.2 Scope and Depth. The
organized to enable the reader to
understand the operation of the sys-
functional description expands upon
tern. The discussion should also be
the introductory discussion of the
presented so as to support trouble-
equipment operation and usually
shooting material as it appears in
appears as a chapter or section of a
chapter. The overall operation
procedural information. Operational
sequences should proceed chrono-
should be analyzed in terms of its
logically; systems operations may
operational or intelligence phases.
proceed chronologically, functionally,
It may be necessary to break out the
or from general to specific.
electrical, mechanical, or hydraulic
systems and analyze them individual-
3.3.1.5 Detailed Specifications.
ly. Such is generally the case for
The following paragraphs present
complex equipment such as missiles
the details for preparation of func-
which have complex electrical and
tional descriptions.
hydraulic systems. The functional
description should give such depth
3.3.1.5.1 Introduction. The intro-
of understanding as to allow a tech-
duction should provide a generic
nician to understand the effects of
description of the equipment and pro-
deviations in assembly and test pro-
vide a brief discussion of the scope
cedures or changes in settings, and
of the functional description.
to be able to make more effective use
of the equipment. The functional de -
3.3.1.5.2 Operational Sequence.
scription should provide new person-
This system-level discussion ex-
nel with a clear understanding of the
pands upon the skeletal operational
operation of the equipment. The dis-
sequence presented earlier in the
cussion should also provide a mainte-
introductory information of the
nance technician with such under-
manual. The operational sequence
standing to make more intelligent
shall be presented chronologically
judgments in problematic situations
in a phase-by-phase treatment.
and to diagnose faults. In large
Operation of each phase is described
equipments, it is not generally
in terms of the function of the series
feasible to cover all possible faults
that may occur in the equipment.
of systems and components within
the equipment. The overall functional
This section of the manual should
coverage should be supported by de-
provide sufficient information on
tailed schematics, or block diagrams,
which to base the use of judgement
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