2003 Cirrus SR20 $174,900.00
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How do you explain the difference between the analog gauge RPM and the RPM's on the MFD?
Tony Sierra, G1 Cirrus SR20
The plane originally came with a tach generator made by Rochester. When Rochester stopped making/ repairing the unit it was replaced by a UMA T1A3-4.
But, the UMA did not put out an accurate signal for both the MFD and analog guage. On my SR20 only the MFD was accurate.
Cirrus told me last week that they were able to convince Rochester to supply them with some more of the original units. How many more I don’t know but I have one on order now.
The P/N is 12323-001
Thanks for the quick reply. I am having the same issue with my SR20. I have been in contact with Cirrus and my mechanic. We did the initial testing of the new RPM sensors Cirrus wanted to test. I ran the plane at different power setting and reported back a spreadsheet of differences with rpms with the MFD and analog gauge. I should have a new RPM sensor by the end of the month.
By the way, in my case the analog gauge was under-reporting the RPMS. In your case it looks like the opposite. I was also told that the analog gauge is the primary gauge and needs to be operational.
No, the correct rpm, for my plane, is on the MFD.
The analog is operational but incorrect.
Yes, in mine too the MFD is correct. Analog gauge in my case, shows a lower RPM.
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