Andy Posted April 14, 2013 Report Share Posted April 14, 2013 I had a very strange failure signature this afternoon and I'm hoping someone might be able to help me point my A&P to the cause. Flying at 1500-1600 feet MSL at cruise (5200 RPM) with air/surface temps about 78 degrees. Lots of turbulence. After about 20 minutes of flight time, we hear noise over the communications system (like a noisy radio). I turn off the radio to see if the noise goes away but it doesn't. Lasts about two minutes and then quits. Shortly after that I notice that the oil temp is running high at about 230. Doesn't make any sense since we've been in cruise for a while. Check oil pressure and it's in the green but down on the low side--about 35--normally runs around 50. CHT in the green but also high. Engine still responsive to throttle and continues to operate smoothly. By this time, we are close to our home field so I hold us high and continue while looking for a spot to land if needed. Make a successful right base entry to landing with the power back at idle. During taxi, engine oil pressure falls to about 20 psi. I think by now we have a serious problem with the engine until I start shutting down avionics. As we shut off the avionics master and the intercom, the gauges all "pop" back into the normal range. We play with turning on gear and watching the gauges and notice some movement when powering on the transponder but nothing definitive. Shut down is normal. Restarted the engine and everything appeared normal. This looks to me like something electrical. Talked this over with my A&P and he thinks it is electrical and was wondering if there was a common junction. That makes me wonder...especially when coupled with the turbulence of the day..that there might be some kind of grounding problem. Has anyone seen anything like this before? Do you think we're on the right track? (Obviously, we'll do an engine check...) Link to comment Share on other sites More sharing options...
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