Bleed Isolation Valve Indication

We had a problem with the overhead Bleed Iso Valve annunciator showing "in-line" and EICAS "Iso Valve Open" blue message with the valve closed. This was an intermittent indication.





Relay K61A in lower left relay panel, second rack back.



Iso valve in hell-hole. Dead center top above ladder landing platform.



#1 DAU. Left radio rack.








The problem turned out to be a bad relay. A short vid showing what it was doing can be found here .

GIV ATA 36, Pneumatics
Isolation Valve Indication
AMM 32-00-00 and 36-12-00
WDM 36-12-00