Description of Driving Event:
Application of Systems Engineering Methodology to ISS Caution and Warning System
Lesson(s) Learned:
Design of the Caution and Warning (C&W) system had been lagging behind that of other ISS systems. Priority has now been given to the system engineering effort that is required to resolve conflicting operational concepts and to finalize the design.
Recommendation(s):
Continue to apply high-level system engineering attention to the expeditious resolution of C&W design philosophies and implementations.
Evidence of Recurrence Control Effectiveness:
NASA concurs. The ISS Caution and Warning (C&W) system has matured throughout 1996, with improvements in tone commonality, event definition, Personal Computer System (PCS) display development, application code generation, and recognition by all program elements. The C&W System Integration Team's (CWSIT) primary purpose is to ensure that the C&W system is safe, robust, and integrated throughout the vehicle and throughout the lifetime of the program. The team's primary responsibilities include: - Providing end-to-end C&W design integration, including display and response concept definition.
- Developing and leading a forum for resolution of C&W design/operational issues Attachment 1 provides specific responses based on the current design for the examples cited in Section III: Information in Support of Findings and Recommendations, ASAP Annual Report, February 1997.
In addition, in response to the ASAP concerns, the International Space Station Program Office (ISSPO) has tasked two independent assessments of caution and warning activities. These efforts are led by the Manager, ISS Independent Assessment, and the ISS Chief Engineer. These assessments were completed in August 1997.
Documents Related to Lesson:
N/A
Mission Directorate(s):
- Space Operations
- Exploration Systems
Additional Key Phrase(s):
- Aerospace Safety Advisory Panel
- Configuration Management
- Human Factors
- Risk Management/Assessment
- Safety & Mission Assurance
- Software
- Spacecraft
- Standard
- Test & Verification
Additional Info:
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