Trio Avionics Pro Pilot - Manual (Page 69)

Trio Pro Pilot Manual 3.8
69
Setting Pull-In Gain
Press the H MODE switch again to position the cursor adjacent to the PI (Pull-In) value.
The PULL-IN gain may be adjusted if you feel the aircraft is not responding appropriately when you
request large course changes.
As an example, assume that you are in the course mode and you use the encoder switch to program a
90 degree course change. Initially, the aircraft will establish a constant turn rate which will decrease as it
approaches the correct course. If you feel that the “pull in” after the turn shallows is too slow, you might
wish to increase the PI gain. If it is overshooting the new course, you may wish to lower the PI gain.
1. Enter the PREFERENCES SETTINGS menus as
detailed previously and select the SET HNAV GAINS
menu.
2. Use the H or V MODE button to select the PI
parameter.
3. Increase this number one count.
4. Exit the calibration screens (press and hold encoder knob until the normal navigation screen
returns.
Setting the Overall Horizontal Servo Gain
The H NAV system gain setting optimizes the overall Pro Pilot altitude control system horizontal tracking
performance. This adjustment allows the Pro Pilot to be tailored to your individual airplane. The factory
setting is a nominal value which should give good performance in most airplanes.
The HNAV servo gain is used to increase or decrease the overall response of the HNAV servo and its
control of CRS, TRK and PI. In some installations the lever arms cannot be mechanically adjusted to
accommodate the required range of travel or linking to the control system. In some airplanes the control
systems are so sensitive that the factory preset servo gain is a little high for that particular installation,
The HNAV servo gain adjustment procedure is made available to accommodate these variations.
NOTE: After a change in the H NAV servo gain, the CRS, TRK and PI adjustments may need to be
readjusted. Please contact Trio Avionics if you think you may need to change this adjustment
from factory settings.
To enter the SET H SERVO GAIN selection, perform the following steps:
1. Enter the PREFERENCES SETTINGS menus as detailed previously and select the SET H
SERVO GAIN menu.
2. Press and release the H MODE button. The arrow will be placed at the HNAV servo gain value.
To adjust this value, rotate the encoder to increase or decrease the displayed value, otherwise
continue with step 3.
3. Press and release the H MODE button.
The SET H SERVO GAIN procedure is complete and the encoder can now be used to select another
menu screen.