NASA-LLIS-0449

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

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T18:48:12Z
date available	2017-09-04T18:48:12Z
date copyright	33222
date issued	1990
identifier other	KOBEQCAAAAAAAAAA.pdf
identifier uri	http://yse.yabesh.ir/std;jsery=autho47037D83FCDCAC426159DD6EFDEC9FCD/handle/yse/229407
description abstract	Description 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.
language	English
title	NASA-LLIS-0449	num
title	Lessons Learned - Migration of Conductive Contaminates in an Electrical Switch in Zero "G"	en
type	standard
page	2
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1990
contenttype	fulltext
subject keywords	Hardware
subject keywords	Parts Materials & Processes
subject keywords	Test & Verification