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Unformatted text preview: .1. The trade studies focus
on different issues depending on the phase of the
project. In Phases A and B, trade studies focus on
high-level issues such as whether a spacecraft in LEO
should be serviceable or not, what mix of logistics
modules seems best to support an inhabited space
station, or what's the optimum number of maintenance
levels and locations. In Phases C and D, the focus
changes, for example to an individual end-item's optimum repair level. In Phase E, when the system design
and its logistics support requirements are essentially
understood, trade studies often revisit issues in the light
of operational data. These trade studies almost always
rely on techniques and models especially created for the
purpose of doing a LSA. For a catalog of LSA
techniques and models, the system engineer can
consult the Logistics Support Analysis Techniques
Guide (1985), Army Materiel Command Pamphlet No.
By the end of Phase B, the results of the ILSS
functional analyses and trade studies should be
sufficiently refined and detailed to provide quantitative
data on the logis- MIL-STD-1388-1A/2B
NHB 7120.5 suggests MIL-STD 1388 as a guideline
for doing an LSA. MIL-STD 1388-1A is divided into
LSA Planning and Control (not shown in
Figures 31a and 31b)
Mission and Support System Definition
(shown as boxes A and B)
Preparation and Evaluation of Alternatives
(shown as boxes C, D, and E)
Determination of Logistics Support Resource
Requirements (shown as box F)
Supportability Assessment (shown as boxes
G and H.
MIL-STD 1388-1A also provides useful tips
and encourages principles already established in this
handbook: functional analysis, successive refinement
of designs through trade studies, focus on system
effectiveness and life-cycle cost, and appropriate
models and selection rules.
MIL-STD 1388-2B contains the LSAR relational data
table formats and data dictionaries for documenting ILS
information and LSA results in machine-readable form.
accomplished by doing a task a...
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