1、Lessons Learned Entry: 0065Lesson Info:a71 Lesson Number: 0065a71 Lesson Date: 1992-03-16a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Mercury Switch Terminals Description of Driving Event: The shear mode resonant dampening (SMRD) lab is utilized to support the process o
2、f applying SMRD material to printed circuit boards. Problems were encountered with one of the ovens (blue M model POM-223) used in the SMRD application process not maintaining the set temperature. A technician sent to investigate opened the front panel to perform a visual inspection and upon closing
3、, a mercury switch mounted close to the chassis inside the front panel arced and exploded.Lesson(s) Learned: Electrical terminals of mercury switches located too close to the chassis, result in electrical arcing and mercury switch explosion.Recommendation(s): Provide electrical insulation of the swi
4、tch terminals from the chassis.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 IHSN/AAdditional Key Phrase(s): a71 Energya71 Facilitiesa71 Hardwarea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for Resale-,-,-
