David Mazer Posted March 23, 2012 Report Posted March 23, 2012 I have been having an intermittent problem with my avionics master relay leaving all the avionics on. I have been told it is kaput and needs to be replaced. Stacey at Mooney said the old relay isn't available but a replacement kit is available for only $969.38. Stacey also says the correct part number is either MB 4443 or MB 443-1. Anyone know of an available part or a less expensive alternative? Quote
Piloto Posted March 23, 2012 Report Posted March 23, 2012 Most of these relays you can get it directly from the manufacturer or electronis parts suppliers for a much lower price. I paid for mine $35 from a local truck parts supplier and it was exactly the same part with the same manufacturer part number. On the relay itself check for a part number or manufacturer. José Quote
jetdriven Posted March 23, 2012 Report Posted March 23, 2012 that clear cover with the part number on it also is removeable Quote
David Mazer Posted March 24, 2012 Author Report Posted March 24, 2012 So, if I only know the relay is somewhere on the copilot side, can someone give me info on how to identify this particular relay? Quote
David Mazer Posted April 21, 2012 Author Report Posted April 21, 2012 Follow up on the master relay about which I posted. The shop pulled the relay and found that there was some carbon build up. Another friend recommended diode suppression and the shop installed one after cleaning out the carbon. Parts - zero. Labor - $500 (ouch). So far, so good. Quote
flyboy0681 Posted May 18, 2012 Report Posted May 18, 2012 Old post I know, but my plane just experienced the same thing. The avionics buss was always on regardless of the position of the avionics master. It turned out to be carbon buildup on the relay and the existing component was removed and cleaned and didn't require replacement. Not sure how much the bill is going to be but according to the shop, the relay is part of the airframe and needed to be removed and re-installed by an A&P in order to be signed off on. The avionics shop had to farm this part of the job out. Quote
David Mazer Posted May 18, 2012 Author Report Posted May 18, 2012 Flyboy, You may want to add the diode supression since that should prevent it from happening again. Quote
flyboy0681 Posted May 18, 2012 Report Posted May 18, 2012 Quote: Mazerbase Flyboy, You may want to add the diode supression since that should prevent it from happening again. Quote
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