Engineering analysis into the replacement of the centralized high pressure air system for DDG 51 class flight IIA

The deletion of the Centralized HPAS from DDG 51 Class Flight IIA, and the development of improved, more cost effective, dedicated subsystems via ECP 51-1216 was a considerable effort which required a structured design approach. The approach taken and described in this paper closely resembled the systems development process prescribed by reference (a); deviations taken (1. e. formal preparation of functional flow diagrams and detailed R&M calculations/allocation), were carefully considered and balanced against Program schedule and cost constraints, as well as overall Program objectives for development of detailed specificat10n requirements. Further, Program direction to utilized existing, proven, and supported hardware, coupled with limited prototype testing, reduced the risks associated with such deviations. Moreover, this paper demonstrated the significant influences of human factors in the design of each new replacement subsystem; it was shown that consideration of such human factors attributes as functional effectiveness, operator safety, accessibility, and operability are fundamental to proper system design throughout the system development process. To this end, the objectives cited in Section 1.1 of this paper were met.