Mark W

I just got a Bendix King replacement switch for my Ovation 2 from my Mooney Service Center. New switches are very expensive. I believe the part number is 200-01902-0000. LASAR apparently has them in stock as do some others, for example, Cessnaparts.com. At the latter, the price is about $1100. Installation requires some skill as jumpers must be added and soldering is required in the airplane with short leads. Mine lasted 13 years.

You’re welcome. Please note that I clarified the wording and fixed a couple of typographical errors, particularly in part b.

You are correct. I meant to say that the previous software was from 2008, not 1998. Thanks for the catch.

I recently had a similar but slightly different experience that I’ll summarize below in hopes of saving someone time and money troubleshooting. Airplane: 2005 Ovation GX with WAAS and GFC 700 issues: 1). Sporadic failure of traffic and WX-500 only during flight (never on the ground). The problem started after upgrading my GX-1000 software to the latest version in March, 2018. The prior software version was from about 2008. I thought that the problem might be sporadic loss of heading information, which will cause the traffic and WX-500 to fail. The Heading indicator requires a loss of information for about 2 min. so I would not see the problem there unless it persisted. My avionics guy confirmed that he has seen this problem before and been told by Garmin that it is because the sampling rate of the newer software revision is too high for the old GMU 44. The newer GMU 44s have a higher refresh rate and can keep up with the software. We replaced the GMU 44 and the problem was solved (after he bricked it the first time). 2). After my last annual, I found that turning on my NAV lights caused my heading indicator to fail about 2 min and 20s later. This was highly reproducible and happened only in the air. The problem turns out to be related to the right trailing edge NAV light. I had the light repaired at annual, including some wiring repairs, and this initiated the problem. The ground point is a rib near the right wingtip. When the right trailing edge NAV light comes on, the magnetometer interference test indicates over 28 Gauss versus about 0.45 Gauss with no NAV lights on. Mooney told my avionics guy that the ground must be relocated to the fuselage using shielded wire. For now, the rear NAV light has been removed and the problem is gone. Relocating the ground is much harder than it sounds because the original ground is almost inaccessible without wingtip removal. Mark