IFD-550 ARS Calibration

There is a new ARS Calibration page in Mx Mode that provides a means to adjust for pitch, roll and yaw off-axis installations (though a roll tilt should be a highly unusual thing).

No jacking of airplane required.   There are 4 fields to enter (pitch, roll, yaw, TAS).

The current procedure is to measure yaw before you put the IFD in the tray.  You are measuring the difference between the longitudinal axis of the airplane the longitudinal axis of the tray.  For most of us, they are one in the same (0 deg). For those folks who have the stack or panel yawed to point more toward the pilot, they need to do that measurement.

You type in the True Airspeed you want to be your trim point.  Say 135 KTAS is your desired level flight enroute TAS.

Then the typical next step is to fly a sortie, hit your desired TAS trim point and record what you are seeing for displayed pitch and roll.

Land the airplane, go back to that page and enter those values.  I would expect roll to be 0 all the time. Part of the reason roll is done in flight is to prevent the flat tire scenario or lard ass pilot in one seat scenario or fuel imbalance scenario.

Pitch will vary from plane to plane when sitting on the ground.  Tail draggers vs tricycle wheel vs in-flight AoA vs etc.

The beauty of this system is you can certainly do that if you want.