1、Lessons Learned Entry: 0002Lesson Info:a71 Lesson Number: 0002a71 Lesson Date: 1989-10-18a71 Submitting Organization: JSCa71 Submitted by: L. UnderwoodSubject: Solder Defects Reduction by Training/certification of Technicians Description of Driving Event: Following the shuttle mission STS-34, it was
2、 determined that a vent door actuator operated on two of the three electrical phases. The vent door actuator was replaced. During the failure analysis, a defective solder joint was found on a lead connection to a printed circuit board, analysis indicated the solder was contaminated with room tempera
3、ture vulcanizer (RTV) silicone potting compound. Records revealed that this defect occurred prior to the requirement to train and certify the solder technicians to the aerospace quality standard DOD-STD-2000.Lesson(s) Learned: Contamination of solder can result in connection defects and failures in
4、electrical systems.Recommendation(s): Training and certification of the solder technicians was upgraded to aerospace quality specifications DOD-STD-2000.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitt
5、ed without license from IHS-,-,-Mission Directorate(s): a71 Exploration Systemsa71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Flight Operationsa71 Hardwarea71 Human Resources & Educationa71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1993-09-09a71 Approval Name: Ron Montaguea71 Approval Organization: JSC/NS3a71 Approval Phone Number: 281-483-8576Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
