1、Lessons Learned Entry: 1048Lesson Info:a71 Lesson Number: 1048a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/External Tank (ET)/Super Light Weight Tank (SLWT) Description of Driving Event: Certification of the Super Light We
2、ight Tank (SLWT)Lesson(s) Learned: The Super Light Weight Tank (SLWT) has completed its design certification review, and proof tests on the first tank have been satisfactorily passed. The only remaining test to complete certification on the SLWT is the cryogenic loading test that will be run on the
3、first production tank on the launch pad. The diligent attention that has been given to quality control, particularly to material inspection and weld integrity, has made this program successful.Recommendation(s): NASA should ensure that the current manufacturing and quality control procedures continu
4、e to be rigidly adhered to and conscientiously followed in production. Evidence of Recurrence Control Effectiveness: NASA concurs with this recommendation. MSFC and Lockheed Martin Michoud Space Systems (LMMSS), the External Tank prime contractor, periodically perform a NASA Engineering and Quality
5、Audit (NEQA), which focuses on both the processes and the flight hardware. The audit is conducted by experienced MSFC and LMMSS technical and management personnel and the operators and inspectors that actually utilize those processes. LMMSS also performs internal and supplier audits throughout the y
6、ear. In addition, on-site MSFC Science and Engineering, Safety and Mission Assurance, and DCMC personnel provide continuous insight and guidance through surveillance and limited oversight activities. Finally, adherence to manufacturing and quality control Provided by IHSNot for ResaleNo reproduction
7、 or networking permitted without license from IHS-,-,-procedures is one of the primary focuses of the on-site government personnel.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Cryog
8、enic Systemsa71 Ground Operationsa71 Parts Materials & Processesa71 Policy & Planninga71 Pressure Vesselsa71 Risk Management/Assessmenta71 Safety & Mission Assurancea71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-12-13a71 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-,-,-
