Stuart Posted July 22, 2013 Report Share Posted July 22, 2013 Roger asked me to make a post about our recent experience with randomly fluctuating readings. Hopefully our experience will help someone else... Our club has a 2008 CTLS. It gets a lot of use among 16 members, some of whom are in training. Our troubles began with a call from a pilot who was about two hours away from home and getting high RPM alarms. He reported that the oil temperature was fluctuating drastically. It was dropping below 122 degrees frequently and setting off the RPM alarm. I told him it was an indicator problem and to fly it home if he could stand listening to the alarms. After several cycles of crimping the connector and still having random alarms the issue was finaly resolved with new oil temp sender. No surprise here but this is where story gets good. About two weeks of sanity later, a pilot reported several different alarms in flight. Oil temp, EGT, CHT and (get this) fuel pressure were all wildly fluctuating and causing alarms. Since this seemed to involve several systems we had our A&P clean the grounds on the aircraft. It didn't help. Pilots were still getting random readings and alarms anytime they flew. All the noise was cutting down the rental hours so getting it fixed was extremely important. I sent an email to Dynon explaining the symptoms and what steps we'd taken to resolve it. Dynon was quick to respond with a statement that this sounded like one sensor or connector going bad resulting in voltage spikes cascading through the system causing the strange readings and alarms. They suggested disconnecting the sensor leads one at a time then running the engine to see if the readings/alarms were gone. They said disconnecting the bad circuit would result in better readings on the other channels. After several hours of testing we discovered that one connector was bad on the right side CHT sender. Replacing that one connector solved the bad readings and alarms. We've been flying noise free now for about a month and a half. Hopefully, this story will help someone in the future whose dealing with a similar issue. Stuart Link to comment Share on other sites More sharing options...
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