1、Lessons Learned Entry: 1001Lesson Info:a71 Lesson Number: 1001a71 Lesson Date: 1997-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Orbiter/Auxiliary Power Unit (APU) Description of Driving Event: Improved Auxiliary Power Unit (APU)Lesson(s) Learn
2、ed: A new gas generator valve module for the Improved Auxiliary Power Unit (IAPU) is currently entering the process of certification. When fully certified, the IAPU with this new valve is planned to be qualified for 75 hours of operation between scheduled teardowns and overhauls (in excess of 10 yea
3、rs at projected use rates).Recommendation(s): Once certification is achieved for 75 hours of IAPU operation, NASA should establish a periodic inspection and test program to assure that IAPUs continue to perform in accordance with requirements throughout their service life.Evidence of Recurrence Cont
4、rol Effectiveness: An IAPU maintenance plan is being developed by the NASA and contractor technical community. Current activity is focused on developing a maintenance specification, evaluating long-term life of elastomeric components, and organizing a parts tracking/usage database. At the conclusion
5、 of this effort in late FY 1997, a long-term maintenance plan will be baselined for implementation. Supplementing this to provide long-term service life information is a fleet leader test program at WSTF. The WSTF program is currently scheduled to conclude in FY 1999 and is to demonstrate 75-hour ru
6、n time and evaluate 10+ year teardown and overhaul time.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s
7、): a71 Aerospace Safety Advisory Panela71 Hardwarea71 Hazardous/Toxic Waste/Materialsa71 Risk Management/Assessmenta71 Spacecrafta71 Test Articlea71 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-,-,-
