1、Lessons Learned Entry: 1004Lesson Info:a71 Lesson Number: 1004a71 Lesson Date: 1997-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Block II Space Shuttle Main Engine (SSME)/Alternate High Pressure Fuel Turbo pump (ATP HPFTP) Design Description of
2、 Driving Event: Shortcomings in hardware design details for Alternate High Pressure Fuel Turbo Pump (ATP HPFTP)Lesson(s) Learned: The Block II SSME development program has proceeded well, except for the Alternate Turbopump Program High Pressure Fuel Turbopump (ATP HPFTP). The HPFTP has suffered sign
3、ificant failures in testing, which were traced to shortcomings in hardware design details. Corrective actions have been implemented on the HPFTP. Block II engine testing has resumed for this major safety improvement.Recommendation(s): Continue the development and certification test programs as origi
4、nally planned. Accumulate the specified test operating times for the modified ATP HPFTP, and employ the number of test pumps as per the original test plan.Evidence of Recurrence Control Effectiveness: The SSME project is committed to meet the original development and certification plan requirements.
5、 The schedule for certification has been adjusted to accommodate comprehensive resolution of the development problems. Scheduled completion of certification testing is now February 1998. As originally planned, the total “hot-fire time“ for development and certification will exceed 60,000 seconds, ut
6、ilizing eight HPFTP units. Certification will be based on two units with 22 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-tests each, and “hot-fire time“ of 11,000 seconds per pump or 22,000 seconds total certification time.Documents Related to Les
7、son: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Research & Developmenta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-11-01a71 Approval Name: Bill Loewya71 Approval Organization: QSa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
