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Lessons Learned - Migration of Conductive Contaminates in an Electrical Switch in Zero "G"

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T18:48:12Z
date available2017-09-04T18:48:12Z
date copyright33222
date issued1990
identifier otherKOBEQCAAAAAAAAAA.pdf
identifier urihttp://yse.yabesh.ir/std;jsery=autho47037D83FCDCAC426159DD6EFDEC9FCD/handle/yse/229407
description abstractDescription of Driving Event:
APU 2 Fuel Pump Heater was cycling high during flight. Detailed analysis of the thermal switch showed extreme wear from the switch bi-metal disc and case. Large amounts of conductive contaminates were found. Analysis showed that they came from the disc and case. It is concluded that excessive vibration caused the wear and in zero gravity particles were free to migrate into the electrical contacts, resulting in a higher disc deflection to open the thermostat contacts. The result is a higher heater turn off temperature.
languageEnglish
titleNASA-LLIS-0449num
titleLessons Learned - Migration of Conductive Contaminates in an Electrical Switch in Zero "G"en
typestandard
page2
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;1990
contenttypefulltext
subject keywordsHardware
subject keywordsParts Materials & Processes
subject keywordsTest & Verification


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