alexthe5th

I’m looking for both, and the addendum for the M20J.

Does anyone happen to have a lead on where I can get a copy of the GFC 500 installation manual (the actual install manual, not the maintenance/ICA manual) for Mooneys? Unfortunately these seem to be only available to Garmin dealers. Thanks!

Hi @DanM - yup, it’s still available.

Interestingly though, looking at my data logs - whatever my mechanic did when he installed the snubber seemed to have fixed the problem for about a month. There were about 15 flights over that period, and if this issue of vapor in the lines was a fundamental design issue with the M20J, it probably would have manifested itself at some point during that month - but it didn't. I wonder if it's just a simple issue of everything being fully tightened up, and then the transducer (or the snubber) loosening itself and allowing air in.

I don’t recall it ever happening on the original instrumentation, although I hadn’t owned the plane very long before the EIS upgrade. I looked at some old videos I have of the panel in flight and hadn’t seen it occurring. No plumbing changes that I’m aware of, although my A&P installed a snubber after we first saw this occurring. It seemed to stabilize after that, but maybe a month or two later the problem came right back. I’m wondering if the transducer or snubber is loosening slightly and allowing air in. The installed transducer is the Garmin 75 PSIG brass transducer, P/N 011-04202-20. The problem persists on the ground after landing (but the amplitude of the fluctuations are lower at low RPMs). I’m not sure what happens if I shut down and restart the hot engine again, I can give that a try sometime.

Joining the fuel pressure fluctuation gremlins club - curious if anyone can help provide some ideas on how to diagnose this one. Since our GI 275 EIS (and Garmin 75 PSIG 011-04202-20 fuel pressure sensor) installation in our M20J (w/ the IO-390-A3A6 STC), we've been dealing with this sporadic issue of erratic fuel pressure indications - a few observations: The fluctuating fuel pressure indications don't occur every flight, rather they seem to occur on random flights or partially through a flight. We haven't figured out specifically what conditions are necessary for the fluctuations to start happening. The engine runs completely smooth regardless of the fluctuations. Fuel flow is rock solid. On flights when the fluctuations are happening, reducing the RPM from 2600 to 2500 makes the amplitude of the fluctuations significantly worse. Raising the RPM back to 2600 dampens the fluctuations again. Below are a couple of data plots from two flights I recently took on the same day. The first flight had very minor fluctuations present until the end of the flight when I reduced power, and at that point the FP started fluctuating: Then the second flight, the fluctuations continued to be present, and became severe when I reduced the RPM from 2600 to 2500: It seems to occur randomly on flights for no particular rhyme or reason. Curious if anyone has any ideas here on next steps, or has come across anything similar. My A&P added a snubber to the fuel pressure line which seems to have had no effect.

My Hartzell prop's due for an overhaul and thinking about sending it to Western Aircraft Propeller in Sandy, OR - curious if anyone here has worked with this shop before and has any PIREPs to share?

Done! Thanks for the heads up.

Sold.

Yup, it’s still available. I just sent you an email.

Hey folks - have two IAI transducer amplifiers removed during my M20J (28V) avionics upgrade this summer. Part numbers are 950D0311-001 and 950D0311-003. Were removed in working condition with no issues that I'm aware of. $350 each + shipping.

Price reduced to $150.

For sale: Rochester Gauges engine/fuel gauge cluster removed from Mooney M20J (28V) during EIS upgrade. $200. Small tear in gasket under plexiglass screen but otherwise in good cosmetic condition. Located in Seattle, WA.

For sale: EI R-1 digital tachometer removed from M20J during EIS upgrade. In excellent working condition at time of removal. Configured for the following powerplant markings (from POH for M20J with IO-360-A3B6D; may match other Mooney models as well): Green arc to 1500 RPM Yellow arc from 1500 to 1950 RPM Green arc from 1950 to 2700 RPM Redline at 2700 RPM I believe these units can also be sent to EI for reconfiguration if you want a different set of ranges than the above. $150.

For sale: 1 United Instruments 6414 manifold pressure gauge (28V lighting), removed from M20J during EIS upgrade. Was in perfect working condition at time of removal. $100.