Trio Avionics EZ Pilot - v 1.9 User Manual
Page 36
32
It is important to note that, while viewing the calibration screens, you cannot change from
the “Track” mode to the “Course” mode or visa versa. This is because the MODE switch
is devoted to gain adjustment while in the calibration screens. Therefore it is necessary
to select the MODE you wish the autopilot to fly (Track or Course) before entering the
calibration function.
For instance, assume that you are flying in the CRS mode (in smooth air) and you find
that the aircraft “wanders” a few degrees to the left and right. You may wish to enter the
calibration screens to adjust the FINE CRS QLT gain to lessen the deviations. Additional
gain may improve the performance, but be aware that too much gain may also cause
oscillations. You should adjust it to find the “sweet spot” for your aircraft where it holds
the course best. Use the following procedure.
CRS MODE GAIN SETTING
1. Verify the in-flight SERVO POS per the manual procedures
2. Select the CRS mode and allow the airplane to stabilize on the selected
groundtrack (TRK) for a few minutes
3. Select the CALIBRATION screens (press and hold the DISPLAY button until
screens are displayed)
4. Use the MODE button to select the FINE CRS QLT parameter
5. Increase this number one count
6. Exit the calibration screens (press and hold DISPLAY until the normal nav screen
returns
7. Observe tracking performance. If the oscillation increases return to step 3 and
lower the FINE CRS QLT setting by two counts (original count minus one)
8. Repeat steps 3 to 7 until best tracking is obtained. Normally the EZ Pilot will hold
the groundtrack within +/- 1 degree in smooth air
You should then adjust the FINE TRK QLT for best performance while in the Track
mode. To do this you must first exit the calibrations screens, back to the normal autopilot
functions. Here you should place the autopilot in the Track (TRK) mode and allow the
aircraft to stabilize on the track that you have selected on your GPS flight plan. Once the
aircraft is stabilized, press the DISPLAY switch and hold it for 6 seconds to enter the
calibration screens, where you can adjust the FINE TRK QLT. You should increment
and decrement the number by one digit at a time and observe the effect on aircraft
tracking. Use the following procedure:
TRK MODE GAIN SETTING
1. Select the TRK mode an fly to a waypoint about 50 miles or greater distance
2. Allow the airplane to stabilize on the track centerline. Normal smooth air
performance is 0.0+/- 0.03 miles either side of track, and typically you will see
0.00 to 0.01 most of the time
3. Select the CALIBRATION screens (press and hold the DISPLAY button until
screens are displayed)
4. Use the MODE button to select the FINE TRK QLT parameter
5. Increase this number one count
6. Exit the calibration screens (press and hold DISPLAY until the normal nav screen
returns
7. Observe tracking performance. If variation around track centerline increases
return to step 3 and lower the FINE TRK QLT setting by two counts (original
count minus one)
8. Repeat steps 3 to 7 until best tracking is obtained