I used to fly the mechanical gyros by "dots" up or down (which was always a gross approximation due to parallax) but the electronic displays can be precisely flown by degrees up or down. The electronic gyros are so accurate and easy to read without parallax that you have to learn new pitch/power combinations for various flight regimes anyway. If using non-zero pitch/power settings in cruise is unacceptable, the installer can make an adjustment of the pitch correction to better conform to zero degrees in level cruise flight, but the the horizon adjustment feature must still be disabled for certificated aircraft installation. You just need to know the appropriate flight attitudes required for your pitch+power numbers, and of course cross-check level flight with the altimeter and VSI. Approach configuration for level flight at 90 kt is +2.0 degrees. On my AA-5, level flight is about +1.5 degrees. At cruise, you will likely find that level flight is not zero degrees attitude. And you must disable the horizon adjustment feature on the unit. ![]() ![]() (f) When an attitude display is installed, the instrument design must not provide any means, accessible to the flightcrew, of adjusting the relative positions of the attitude reference symbol and the horizon line beyond that necessary for parallax correction.Ĭlick to expand.If you have a certificated G5 (and I presume a GI275) it is by the installation manual to be adjusted so that it reads zero degrees when the plane is level as per the maintenance manual. § 23.1303 Flight and navigation instruments. Some folks get really bothered by this and go about messing with settings to try to get it to read on the horizon while in some variant of level flight. Depending on the aircraft and loading while flying straight and level you may have nose down relative to the horizon, or you may have nose high. This will vary based on gross weight, center of gravity, etc. The calibration steps for these instruments typically call for it to be done with the aircraft leveled per the MM. The FAA regs only allow for parallax adjustment which is why there is no zero adjustment on these glass instruments. With glass, there is no parallax because the everything is in the same plane. Because the horizon and the indicator are in two different planes, adjusting your seat higher/lower, being taller or shorter in the torso, etc, you will see different positions, so there is an adjustment for it. The reason this adjustment is present is parallax. ![]() They are used to being able to adjust the "aircraft" on the horizon on a vacuum/pressure AI. This is a common complaint among folks converting to glass instruments.
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