1、Lessons Learned Entry: 0905Lesson Info:a71 Lesson Number: 0905a71 Lesson Date: 2000-08-01a71 Submitting Organization: GSFCa71 Submitted by: William DaneySubject: NOAA-K AVHRR/HIRS Instrument Louvers Not Connected Description of Driving Event: After launch it was observed that the Advanced Very High
2、Resolution Radiometer (AVHRR) instrument was running hotter than normal. The design calls for active louvers to open to radiate heat and bring the instrument baseplate temperature to within design limits. A review of the procedures used in building the spacecraft indicates the louvers were removed a
3、fter Thermal Vacuum testing and reinstalled as a “Non-flight / Temporary mechanical installation“ for fit check purposes. The connector was not mated at this time. A subsequent decision was made to leave the louvers in place but no notation of the lack of electrical connection was made. There was a
4、procedure run prior to shipment, which is used to verify the mate status of every accessible connector on the spacecraft. This connector was not on the list. The NOAA-K satellite was flown with the thermal louver cable disconnected.Lesson(s) Learned: 1. A critical review of out of flow processes is
5、necessary to insure that no steps are deleted or improperly added.2. Keep good records of all “non-flight“ installations. Discrepancy reports, red tags and/or a configuration log book should be mandated and reviewed at critical milestones.3. Double check all accessible connector matings before space
6、craft shipment.Recommendation(s): See Lesson(s) Learned.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Sciencea71 Spa
7、ce Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Ground Operationsa71 Hardwarea71 Launch Processa71 Spacecrafta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2000-09-18a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
