The Long Duration Exposure Facility (LDEF) was retrieved in 1990 after spending 69 months in low-earth-orbit (LEO). A wide variety of mechanical, electrical, thermal, and optical systems, subsystems, and components were flown on LDEF. The Systems Special Investigation Group (Systems SIG) was formed by NASA to investigate the effects of the 69 month exposure on systems related hardware and to coordinate and collate all systems analysis of LDEF hardware. This report is the Systems SIG final report which updates earlier findings and compares LDEF systems findings to results from other retrieved spacecraft hardware such as Hubble Space Telescope. Also included are sections titled (1) Effects of Long Duration Space Exposure on Optical Scatter, (2) Contamination Survey of LDEF, and (3) Degradation of Optical Materials in Space. Dursch, Harry and Bohnhoff-Hlavacek, Gail and Blue, Donald and Hansen, Patricia Goddard Space Flight Center DEGRADATION; EARTH ORBITAL ENVIRONMENTS; LONG DURATION EXPOSURE FACILITY; LOW EARTH ORBITS; OPTICAL MATERIALS; SPACECRAFT CONSTRUCTION MATERIALS; SPACECRAFT CONTAMINATION; HUBBLE SPACE TELESCOPE; LIGHT SCATTERING; OPTICAL EQUIPMENT; OPTICAL PROPERTIES...

Discussed here is the status of the Long Duration Exposure Facility (LDEF) Systems Special Investigation Group (Systems SIG) investigation through the end of 1991.

Die Entwicklung von Weltraumfahrzeugen ist ein Industriezweig, der in den vergangenen drei Jahrzehnten beständig gewachsen ist. Heute ist es eine komplexe technische, internationale Branche. Dieses Buch vermittelt Informationen über alle Mechanismen von Weltraumfahrzeugen. Spitzenexperten auf diesem Gebiet, die in verschiedenen Disziplinen zu Hause sind, haben einen wichtigen Beitrag hierzu geleistet. Das Buch ist in drei Teile untergliedert: Grundlagen und technische Eigenschaften wichtiger Materialien; Entwicklung und Verhalten kritischer Komponenten und eine Einführung in Fahrzeugniveau-Analysen und Integrationstechniken. (01/98)

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.