REG NASA-LLIS-0500-1992 Lessons Learned - Fasteners.pdf

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1、Lessons Learned Entry: 0500Lesson Info:a71 Lesson Number: 0500a71 Lesson Date: 1992-10-19a71 Submitting Organization: LARCa71 Submitted by: C. CockrellSubject: Fasteners Description of Driving Event: For critical applications either run tests to develop actual torque-preload relationship, or use tab

2、les which were developed using the actual fastener material, joint material, and lubrication and/or locking system. On January 15, 1991 a failure occurred in the 8 foot transonic pressure tunnel during testing of a model wing with attached flap. During the test run, the flap peeled away from the win

3、g, broke free, and proceeded down the tunnel. Extensive damage resulted.Lesson(s) Learned: Torque is not a sufficient measure to assure that joints are assembled with the proper preload.Recommendation(s): While making threaded joints assure that all threads are clean before torquing fasteners. See D

4、escription of Driving Event for critical information.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Parts Materials & Processesa71 Test FacilityAdditional Info: Approval Info: a71 Approval Date: 1997-04-02a71 Approval Name: Elijah C. Kenta71 Approval Organization: 421a71 Approval Phone Number: 757-864-3345Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-