MIL-DTL-87269D
graphic, or dialog within its content model. The contractor shall not redeine primitive elements within the
content speciic DTD. Those elements, using primitive elements, shall be restricted to the structure of
primitive elements as deined within the generic layer.
3.5.2.2 Use of generic DTD template elements. Elements within a content speciic DTD shall conform to
one of the templates deined within the generic layer. Elements shall include the attributes listed under
the generic layer s deinition of the templates. The two common attributes among the ive templates are
identiication (id) and CDM. Each element employing a template includes an identiication attribute for
referencing. The CDM attribute identiies which template an element is employing.
3.5.3 Content speciic DTD for Organizational Level (O-Level) maintenance. The following describes
requirements for the content speciic DTD provided by TMSS.
3.5.3.1 Item/System hierarchy. The vehicle, weapon system, or other equipment that is being maintained and
operated is composed of several layers of subsystems, components, and parts. This hierarchical representation
shall be accomplished by use of a system element that is used recursively, and which breaks down the
equipment into only those components that are being maintained or operated. Each component of this
hierarchy shall have one or more of the following four categories of information associated with it:
a. Descriptive information
b. Procedural information
c. Fault isolation information
d. Parts information
3.5.3.2 Descriptive information. Descriptive information shall contain a hierarchy of narrative paragraphs.
Paragraphs, in turn, may refer to primitive elements. Descriptive information may provide information
on system (subsystem, component, part) physical arrangement, functional behavior, theory of operation,
and other aspects.
3.5.3.3 Procedural information. Procedural information shall be composed primarily of task statements.
Each task element shall be associated with attributes which provide related information such as: estimated
completion time; maintenance level(s) where the task is to be performed; required conditions which shall be
met before performing the task; and the number of people required to perform the task. A procedural
element may be linked to other elements which deine the support equipment and consumables that task
requires, through the establishment of appropriate relationships.
3.5.3.4 Fault isolation information. Fault isolation information shall contain data necessary to isolate faults
found in a system. Fault isolation information shall contain fault elements, fault state elements, test
elements, outcome elements, and rectiication elements.
3.5.3.4.1 Fault elements. Fault elements shall identify potential faults which might occur in the system.
3.5.3.4.2 Fault state elements. Fault state elements shall present a list of faults implicated as the result of a
test that has been performed. Each suspected fault in the list shall be weighted, based on the probability that
it is the cause of the observed malfunction. The fault state element may also present a list of possible faults
that have been eliminated from consideration as the result of tests performed.
3.5.3.4.3 Test elements. Test elements shall contain a link to the procedural instructions a technician
must follow to carry out a required task at a particular juncture in the fault isolation procedure. Test
elements shall also provide all possible test outcomes.
3.5.3.4.4 Outcome elements. Outcome elements shall contain deinitions of new fault states associated with
the results of a particular test. Outcome elements shall also contain a description of the state of the item
being maintained. An outcome is based on one or more expressions (i.e., system states which shall be
established for the speciic outcome to apply). The inal outcome element of a fault isolation procedure shall
have a relationship which associates it with an identiied fault. The identiied fault has, in turn, associated
with it the initial element of the appropriate corrective maintenance action.
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