1、Lessons Learned Entry: 0212Lesson Info:a71 Lesson Number: 0212a71 Lesson Date: 1992-11-17a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Orbiter Computer Systems Description of Driving Event: The space shuttle computer system faces a continuing evolution in flight requirem
2、ents and increased equipment obsolescence accompanied by greater and more expensive maintenance problems. There is a large list of waiting software change requirements covering such things as the extended duration orbiter missions, crew requested changes, mission-specific changes, and general improv
3、ements. Due to the rapid evolution of computer technology, it is difficult to keep any given generation of computer equipment in use for more than a few years. After that, it becomes increasingly difficult to obtain replacement parts. There is also the opportunity to incorporate new capabilities. In
4、 the projected 30-year horizon for the space shuttle, it will be necessary to upgrade the system several times.There now are a number of arguments that favor starting a study for long-term space shuttle avionics computer evolution. They are based on the events that can be expected in 8 to 10 years.
5、The hardware in the “new“ general purpose computer will become obsolete and require replacement in about that time period. Also within that time period, the limit on available memory in the space shuttle computers will have been reached. Expansion with the “new“ general purpose computer will not be
6、possible without major software changes that would require massive reverification.Lesson(s) Learned: The current ad hoc approach of treating each computer upgrade as an independent action is proving to be unsatisfactory.Recommendation(s): Implement a study to plan a path of evolution for all future
7、changes in avionics computer hardware Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-and software for the life of the space shuttle.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Space Op
8、erationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Computersa71 Flight Equipmenta71 Launch Vehiclea71 SoftwareAdditional Info: Approval Info: a71 Approval Date: 1994-06-08a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
