REG NASA-LLIS-3197-2010 Lessons Learned - Proof-Load Testing of Ground Support Equipment (GSE) Platforms Slings and Handling Fixtures Versus Rated Load Testing.pdf

1、Public Lessons Learned Entry: 3197Lesson Info:a71 Lesson Number: 3197 a71 Lesson Date: 2010-05-26 a71 Submitting Organization: KSC a71 Submitted by: Annette Pitt Subject: Proof-Load Testing of Ground Support Equipment (GSE) Platforms, Slings, and Handling Fixtures Versus Rated Load Testing Abstract:

2、 For many years Ground Support Equipment (GSE) was periodically proof loaded based on NSTS 08171, Operations and Maintenance Requirements and Specifications Documents (OMRSDs) File VI requirements. This caused premature wear of components, decreased safety, and increased time to perform maintenance.

3、 Reliability Centered Maintenance (RCM) methodology was used to determine optimum maintenance tactics for GSE and flight assets. Description of Driving Event: During Orbiter Processing Facility (OPF) open bay periods the Orbiter Maneuvering System (OMS) pod handling fixture was proof loaded to 20,00

4、0 lbs. This required extensive setup, working at heights, working with suspended loads, and the setup of safety clears for two days. The 20,000-lb weights were raised to the handling fixture and then transferred from the crane hook to the handling fixture. The load was then translated full travel pa

5、th both east and west. Any type of a failure at this point would have caused extensive damage. Lesson(s) Learned: Annual proof load testing could be replaced with nondestructive evaluation (NDE) inspection of the critical welds. Proof load of GSE can be replaced with visual/NDE inspections and rated

6、 load tests. KNPR 8715.3 provides a section for the nonload test of slings and lifting fixtures. In the case of the OMS pod handling fixture, it is 200% of rated load. In most other cases, it is 150%. Recommendation(s): Perform a review of test history, maintenance performed, operation history, and

7、design safety to determine the optimum maintenance requirements. Evidence of Recurrence Control Effectiveness: N/A Documents Related to Lesson: 1. KNPR 8715.3, KSC Safety Practices Procedural Requirements 2. NSTS 08171, Operations and Maintenance Requirements and Specifications Documents (OMRSDs) Mi

8、ssion Directorate(s): a71 Space Operations Additional Key Phrase(s): a71 1.Early requirements and standards definition a71 1.Engineering design and project processes and standards a71 1.Ground processing and manifesting a71 1.Configuration control and data management a71 1.Maintenance a71 1.Planning

9、 of requirements verification processes a71 1.Long term sustainability and maintenance planning Additional Info: a71 Project: Space Shuttle Program Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 2010-10-08 a71 Approval Name: mbell a71 Approval Organization: HQ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-