1、Lessons Learned Entry: 0517Lesson Info:a71 Lesson Number: 0517a71 Lesson Date: 1994-08-03a71 Submitting Organization: LARCa71 Submitted by: Bernard LewisSubject: Failure of a Parachute Recovery System During a Drop Test Description of Driving Event: During a drop test at the NASA Plum Tree Island Te
2、st Facility, a model was severely damaged due to failure of its parachute recovery system. The failure of the recovery system resulted from teflon cloth jamming closed the canopy compartment lockoff flaps. The teflon cloth had been wrapped around the suspension lines to expedite extraction of the fo
3、lded lines.The parachute contractor design personnel chose to add the cloth because its lubricating effect on the suspension lines and the resultant lowering of the force required to extract the lines. The information concerning the design change and lower opening force was transmitted to the resear
4、ch project engineer by telephone conversation. Significantly, no confirming strip-out load tests were performed with the teflon wrapped lines prior to using them in an actual test.The primary finding of the investigation committee was that teflon cloth jamming prevented the bag from opening and the
5、canopy extracting.Lesson(s) Learned: Teflon cloth wrapped around the suspension lines to expedite extraction of the folded lines, jammed closed the canopy compartment lockoff flaps and caused failure of the recovery system.Recommendation(s): The committee investigating the mishap recommended that pr
6、ior to use with future models, parachutes procured by NASA-LaRC should be checked for appropriate and safe design; definitive specifications should be included with every parachute ordered by NASA-LaRC; and, any instance of change to parachute packing or repacking procedures, or to the parachute des
7、ign, should require Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-LaRC approval prior to implementation.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 A
8、ircrafta71 Range Operationsa71 Test ArticleAdditional 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-,-,-
