1、Lessons Learned Entry: 1063Lesson Info:a71 Lesson Number: 1063a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: International Space Station (ISS) Program/Caution and Warning (C&W)/Systems Engineering Description of Driving Event: Lack of Systems Eng
2、ineering in ISS Caution and Warning (C&W) System DesignLesson(s) Learned: Although considerable progress has been made during this past year in ISS Caution and Warning (C&W) system design, systems engineering is still not sufficiently evident in the whole spectrum of alarm and warning, situation ass
3、essment, and damage control and repair.Recommendation(s): Initiate a high-priority systems engineering review of the C&W system to define a path for development and implementation of fully integrated alarm, situation assessment, countermeasure functions, and crew actions. Finalize and document C&W s
4、ystem design requirements. Evidence of Recurrence Control Effectiveness: The ISS Program concurs with these concerns and has instituted a C&W Systems Integration Team (CWSIT) to provide direction and management of all C&W development activities, design reviews, C&W display development, event definit
5、ion, and International Partner (IP) integration. Since the last ASAP review, the strength of the CWSIT has grown substantially. Four dedicated engineers were added to support systems engineering, design development, and verification activities. These engineers add to the existing team of mission ope
6、rations, flight crew, Program Office, sub-system representatives, human factors, safety, and independent assessment representatives and meet at least weekly to ensure integration of the C&W system, procedures, and display and controls. Provided by IHSNot for ResaleNo reproduction or networking permi
7、tted without license from IHS-,-,-To finalize system engineering and integration associated with the C&W system design requirements, response procedure development, and display and controls design, the CWSIT conducted a program wide C&W System Integration Review (SIR). The C&W SIR was held between O
8、ctober and December of 1997, and included participants from across the Program and International Partner Communities. This review consisted of two phases, one geared specifically towards SSP 50005, Flight Crew Integration Standards, and another dedicated to identifying integration and design issues
9、within the fault detection, isolation, and recovery display development, audio interfaces, flight rules/procedures, and IP development areas. The C&W review resulted in a total of 35 issues requiring resolution. These issues ranged from editorial comments against the C&W Description Document to the
10、identification of Russian audio interface concerns, Japanese Experiment Module C&W Panel Latencies, requirements modifications, and needed display design changes. The finalized C&W system requirements are documented and controlled within the formal ISS configuration managed specification hierarchy,
11、and any modification, waiver, or deviation requires official Program direction. The CWSIT, which has oversight and extensive involvement with the class 1/emergency procedures, has developed and retains ownership of the classification guidelines/requirements, and maintains control of these requiremen
12、ts through the C&W Working Group. The actual procedure development is assigned to the Mission Operations Directorate (MOD), who is responsible for the particular system, under the direction of the MOD management and Joint Operations Panel. The CWSIT has briefed the development organizations on the g
13、eneral philosophy of the class 1/2/3 procedures required for C&W. In addition, the CWSIT reviews all changes to the class 2/3 procedures after they are placed under configuration control. The integration of C&W event response procedures is ensured across the program by the CWSIT and its constituent
14、MOD, Crew Office, and program sub-system representatives. The situation response and damage control procedures are included in the baselined and configuration managed ISS Mission Rules and Procedures. These flight procedures are integrated into the overall display development and design modification
15、 processes currently in work. The Boeing developed Matrix-X C&W simulator has been brought on-line and is providing simulation support to the program as well as providing a data driven display assessment environment. This simulator has already provided much needed integration support to requirements
16、 and design development and is now geared towards supporting procedure development and crew training. The simulator has been instrumental in the performance of integrated crew reviews of both flight 2A procedures and display architectures. The use of this simulator in conjunction with the Flight Cre
17、w Training Divisions Part Task Trainers has contributed to the development of an integrated, productive, and safe C&W system. The ISSP will continue its support of the CWSIT and ensure that increased levels of attention are maintained to provide a safe, integrated, and operationally viable C&W syste
18、m.Documents Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Human Factorsa71 Information Technol
19、ogy/Systemsa71 Policy & Planninga71 Research & Developmenta71 Risk Management/Assessmenta71 Safety & Mission Assurancea71 Softwarea71 Spacecrafta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-12-14a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
