REG NASA-LLIS-0466-1995 Lessons Learned - Nozzle Aging - Scout Program.pdf

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1、Lessons Learned Entry: 0466Lesson Info:a71 Lesson Number: 0466a71 Lesson Date: 1995-06-14a71 Submitting Organization: LERCa71 Submitted by: Judy TerlepSubject: Nozzle Aging - Scout Program Description of Driving Event: During the visual receiving inspection process of the fourth stage Altair IIIA mo

2、tor for a 1984 launch from the Wallops Flight Facility, a delamination was found in the silica phenolic exit cone liner. A similar delamination was found in a nozzle being processed for a Vandenberg Air Force Base launch. An immediate visual, ultrasonic, and radiographic inspection of the remaining

3、inventory of silica phenolic exit cone liner nozzles found one other nozzle that was suspect. The same inspections were completed concurrently for inventory nozzles that included graphite phenolic exit cone liners. No delamination indications were found in the carbon phenolic exit cone liners.The de

4、lamination was determined to be a moisture related problem associated with silica phenolic. A monitoring program was established for the remaining silica phenolic nozzles and carbon phenolic nozzles. This monitoring consisted of storing the nozzle assemblies in the Dallas Scout Logistics Area, monit

5、oring humidity, and attaching gages to one of the carbon phenolic nozzles and a dissected nozzle piece to measure strain on a periodic basis. Visual, ultrasonic, and radiographic inspections were completed at Dallas just prior to shipment to verify that a flightworthy nozzle would be shipped to the

6、field site.Lesson(s) Learned: Nozzle aging experience indicates nozzles can have age related problems.Recommendation(s): Include nozzles and related components in shelf life surveillance programs.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking

7、 permitted without license from IHS-,-,-Continued monitoring of the silica phenolic or graphite phenolic exit cone material in the Altair IIIA nozzle revealed no other delamination. This meant that a production was not required and inventory nozzles could be flown.Documents Related to Lesson: N/AMis

8、sion Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 Launch Vehiclea71 Logisticsa71 Packaging Handling StorageAdditional Info: Approval Info: a71 Approval Date: 1996-10-25a71 Approval Name: Sell Jamesa71 Approval Organization: 501-4a71 Approval Phone Number: 216-433-8618Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-