CalebH

Hey guys and gals. Our fuel pressure gauge has become somewhat erratic and as we work through things during annual with our IA we may need to overhaul/replace it. Going to reach out to overhaul shops to see about pricing, but figured I'd see if any of you have a known working gauge leftover from a panel upgrade that you'd be willing to part with. It's the combined manifold and fuel pressure gauge with a fuel pressure upper limit of 6psi. 1966 M20C. Thanks! Also open to overhaul shop suggestions if we go that route - we're in Ohio.

RESOLUTION: We solved the problem. Even though Garmin states you should be able to calibrate the devices when the plane isn't leveled and then measure and manually apply the offsets, we were limited to 15 degrees of offset which didn't quite get us to where we needed to be. We leveled the plane and then had the devices automatically do their calibration - solved the issue. Not quite sure why this would work and the method garmin calls out in the manual wouldn't. Who cares, it's working now...

Yes, what you're saying is true for mechanical gyros. In this case, the G5 being solid-state ADAHRS, it just comes down to a calibration. I think what @Vance Harral was getting at is that the adjustment on the AI was to accommodate different pilots' flying positions since parallax is a physical limitation of the mechanical AIs. For a digital unit like the G5 you certainly want to follow the procedure and ensure that the attitude indicator is on the horizon when the plane is level. Then, it shouldn't be changed as there is no parallax with a screen. There's a reason Garmin doesn't give you the option for in-flight adjustments. The issue we were running into is even after following Garmin's procedure for calibration it seems that the attitude indicator does not show level when the plane is level. Our next step is to just level the plane and recalibrate to see if doing it the "hard way" fixes it somehow.

You make a good point about the AI being a horizon reference - I think this is something many people don't understand (and I understand I may have sounded like I didn't either!). Yes, the airplane's attitude in flight relative to level changes based on a number of factors including environmental, loading, airspeed, etc. The problem we're having is that the AI is notably nose down (like 2.5 deg.) which is lower than it should be, even after we followed the calibration procedure. Now, the current Garmin manual calls for you to take a reference level (from a rivet line on our model), do the calibration, and then put in that offset. This negates any need to level the aircraft for calibration in theory. I think we may just level the plane and calibrate it again to see if we were doing the procedure wrong in the Garmin manual, though.

Angle for Vy (airspeed) climb will change based on a lot of factors including environmental and loading. Naturally, your attitude will increase when flying at slower airspeeds if you're in unaccelerated level flight.

Is your panel just attached to the sub panel or did you make it more “vertical” when you installed? Ours isn’t changed in angle from the original. We attached flush to the sub panel.

That's what we're probably going to have to do. Just wanted to check with others first.

Does your plane have a flat panel/are they going to install one?

EDIT: Problem Solved Leveling the airplane and re-running the calibration worked. See my comment at the bottom of the string for more details. Hi all, Question for those of you who have installed Garmin G5s. We're wrapping up an avionics install with our A&P-IA that includes dual G5s and after following the pitch calibration procedure based on the level position of the airplane (rivets above tail-section access) we end up maxed out on the G5 in pitch offset with the G5 still showing around 2.5 deg. nose down in level cruise flight. Was reading through the Garmin manual again and it seems that 15 deg. is the max pitch offset that's allowable. For reference, our panel is flat (no step) and we did not add spacers to make the pilot side vertical - it just looks better when it's the same all the way across IMO. Have any of you successfully done G5's with a flat panel without changing the angle of the entire panel? I could have sworn I'd seen some airplanes set up like ours... I'm really hoping we're missing something, but it's looking like we're going to have to tilt the pilot's side to make up for the 2.5 degs. we can't get with the G5 offset. For reference, this is a 1966 C model. The picture of the G5s is in level cruise. Thanks!

@carusoam I know this has been quite a while, but did you have any issues with the panel tilt exceeding the 15 deg. allowable for the G5s? We’re having this issue as we show around 2.5 deg. nose down in level flight with the pitch offset on the G5 maxed out.