1、Lessons Learned Entry: 0342Lesson Info:a71 Lesson Number: 0342a71 Lesson Date: 1994-08-09a71 Submitting Organization: MSFCa71 Submitted by: Ellis BaggsSubject: Critical Hardware Functional Verification Description of Driving Event: On the STS 51/TOS mission, during payload deployment, commands inten
2、ded to initiate only the primary SUPER*ZIP explosive cord actually resulted in the simultaneous firing of both the primary explosive cord and back-up explosive cord. This simultaneous explosive cord firing resulted in the rupture of a SUPER*ZIP containment tube and the release of contaminants and hi
3、gh energy debris into the orbiter cargo bay.Lesson(s) Learned: All payload systems having catastrophic hazard potential for orbiter/crew as a result of operations in or near the orbiter must use hardware and procedures that have been submitted to a rigorous verification program to verify that the fu
4、nctionality of the system fulfills the safety and design requirements objectives.Recommendation(s): Perform an end to end systems engineering evaluation utilizing end to end functional testing or simulated testing to verify that the functional design is compatible with the requirements at all interf
5、aces and to assure proper system performance and prevent loss or misapplication of safety critical functions.Evidence of Recurrence Control Effectiveness: With the end to end testing of the functionality of a system, there is a higher probability of assurance that this type anomaly will be detected
6、and resolved prior to flight.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energetic Materials - Explosive/Propellant/Pyrotechnica71 Hardwarea71 Safety & Mission Assurancea71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1994-08-17a71 Approval Name: Billy Colea71 Approval Organization: CR10a71 Approval Phone Number: 205-544-2365Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
