Daneshgari Posted February 4, 2020 Report Posted February 4, 2020 That makes sense to me. Mooney brings up the relay chatter as the possible cause. They suggested a slight aliment of the contacts to prevent this from happening again. Will see how it goes. Who needs flaps any way.
larryb Posted February 6, 2020 Report Posted February 6, 2020 The pictures in this thread show manufacturing defects. The relays are supposed to be vented, but the vent nib has not been broken off after assembly. This can reduce the contact life 20 to 50% according to this app note. https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=13C9136_Venting_Sealed_Relays_AppNote&DocType=CS&DocLang=EN
thinwing Posted February 6, 2020 Report Posted February 6, 2020 I wonder if by venting theses relays you introduce a pathway for contamination...tks fluid,oils exaust by products that are corrosive to the contacts.TE also mentions that contact life expectancy is a product of current running thru those contacts.TE indicates venting helps remove ionized byproducts caused by contact arcing...I wonder if these relays held a vacumn what would be their life expectancies
EricJ Posted February 7, 2020 Report Posted February 7, 2020 1 hour ago, thinwing said: I wonder if by venting theses relays you introduce a pathway for contamination...tks fluid,oils exaust by products that are corrosive to the contacts.TE also mentions that contact life expectancy is a product of current running thru those contacts.TE indicates venting helps remove ionized byproducts caused by contact arcing...I wonder if these relays held a vacumn what would be their life expectancies Arcing increases as pressure decreases since the air is relied on to provide resistance when the contact is open. This is why pressurized magnetos are used for high-altitude flight.
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