MIL-STD-2106A(SH)
5.2.2.3 Interface analysis. When breakdown diagrams are prepared, the mechanical, electrical, liquid, optical, and gas interfaces are each represented by a single line. Each single line may be composed of several signals and connections between equipment. When specified (see 6.2), interface analysis records shall be submitted. The first step in interface analysis shall be to list on an interface analysis form, all of the electrical or optical signals and liquid, gas, or mechanical connections that comprise each interface. Each item listed on the interface analysis form shall be identified by a brief descriptive title that focuses on its salient characteristics. Individual items shall then be analyzed to determine if they are appropriate for testing. Guidance to make this determination shall be based in the following questions:
a. Must this interface be tested in order to demonstrate satisfactory equipment performance?
b. Does this interface require checkout prior to equipment operation?
c. Would testing of this interface provide information concerning a potentially unsafe or hazardous condition of the equipment?
d. Is measurement of this interface a necessary prerequisite to further testing?
Responses to these questions shall be indicated on the interface analysis form. A positive response to any of these questions is an indication that the interface should be considered for testing. The result of interface analysis is a list of recommended interface test elements.
5.2.3 Test element selection. The lists of test elements resulting from functional, characteristics, and interface analyses shall be screened to determine which elements are appropriate for industrial testing. The objective of industrial testing is to demonstrate the ability of shipboard equipment and systems to perform their intended function. Compliance with design specifications shall be assumed to have been demonstrated in previous testing. Consequently, only those elements that meet one or more of the following criteria shall be selected for inclusion in the test outlines and test procedures to be developed.
a. Elements that are essential to equipment performance and operation.
b. Elements whose performance may be seriously degraded by shipping, installation, or shipboard environment.
c. Elements whose performance is affected by post-installation adjustments.
d. Elements whose performance is essential to overall system performance or to operation of other equipment. e. Elements that provide indication of safe operation.
f. External interface elements that must be verified prior to operation of the equipment under test. The results of this analysis shall be a composite list of test elements selected for industrial testing.
5.2.4 Test stage determination. When preparing test procedures and test outlines for a test stage, the TDA shall decide which test elements are appropriate for evaluation at that stage and which elements should be evaluated at higher or lower stages.
5.2.4.1 Test stage guidelines. As a general rule, any function, characteristic, or interface required to adequately demonstrate equipment performance shall be tested at stage three, system performance at stage four, and intersystem performance at stage five. Test elements that require special simulation facilities or significant resources external to the immediate testing location shall be tested at stage six. Test elements which require testing at sea shall be evaluated at stage seven. Test elements evaluated in lower level tests that need to be re-evaluated during trials
should be designated for testing at both stages. Although seven stages of testing are defined, it is not intended to require testing at each stage for each equipment or system. For example, stand-alone equipment may be tested at
stage three only and other systems may not lend themselves to equipment level testing.
5.2.4.2 Test stage assignment. Using test stage definitions found in Appendix A and the test stage guidelines of
5.2.4.1, the test elements shall be separated into two lists: (1) those elements which are appropriate for testing at the stage for which test procedures are being prepared, and (2) those elements which are appropriate for testing at another stage for which the TDA is not responsible. When specified (see 6.2), those test elements that are candidates for testing at another stage for which the developer is not responsible shall be listed with their
recommended test stage and submitted.
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