REG NASA-LLIS-0050-1991 Lessons Learned - Delta Wiring Harness Connectors and Installation.pdf

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1、Lessons Learned Entry: 0050Lesson Info:a71 Lesson Number: 0050a71 Lesson Date: 1991-12-24a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Delta Wiring Harness Connectors and Installation Description of Driving Event: Premature shutdown of the main and vernier engines occurr

2、ed as a result of an electrical malfunction in the vehicles power bus, specifically a short circuit to ground. A Mishap Board investigation concluded the most probable cause of the failure was flight vibration that induced mechanical damage to wiring insulation resulting in a short to ground.Lesson(

3、s) Learned: 1. Wiring harness connectors of critical components must be capable of withstanding vibration induced stresses.2. Failure to protect wiring harnesses from abrasive surfaces and sharp edges of structural members will lead to wire damage caused by flight vibration.Recommendation(s): 1. Ide

4、ntify and implement improvements in the quality review, inspection, and testing of connectors in proportion to their criticality.2. Prior to future launches, perform megger checks of all critical wiring harnesses and inspect harnesses to verify quality of installation.Evidence of Recurrence Control

5、Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Configuration Managementa71 Flight Operationsa71 Flight Equipmenta71 Hardwarea71 Launch Process

6、a71 Launch Vehiclea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-