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An interactive graphics system is being used extensively at McDonnell Aircraft Company (MCAIR) for the production design of the F-18 weapon system. Examples are discussed wherein computer graphics has been used in applications varying from preliminary design studies to finished detailing of production part drawings. Structural part definition, mechanism design, clearance and visibility studies, structural analysis and hydraulic system routing are cost-effective applications. Benefits among engineering groups and to downstream users of computer-stored geometry definitions are also discussed.

The Space Shuttle Orbiter is a combination spacecraft and aircraft which can remain in orbit from 7 to 30 d and also fly horizontally and land on existing commercial airport runways. The vehicle utilizes gimballing of the main rocket engines for control during ascent and typical aerodynamic surfaces for control during reentry, approach, and landing. A hydraulic system was selected as the power source for operation of these controls and for actuation of the landing gear, brakes, steering, and jet engine deployment. This paper discusses the system selection rationale, power requirements, flight control characteristics, operational profile, maintenance features, built-in test requirements, and innovative features of the hydraulic system. The system design provides for spacecraft reliability with commercial aircraft serviceability.