Trio Avionics Pro Pilot - Manual (Page 66)

Trio Pro Pilot Manual 3.8
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Usually, an increase or decrease of 1 unit is sufficient to tune the CRS mode tracking to a
particular aircraft and GPS system. After changing the value, or if you want to bypass this
setting, proceed to step 3.
3. Press and release the H MODE button. The arrow
will be placed at the TRK setting value.
Adjust this setting only while in the TRK mode To change this value, rotate the encoder to
the desired setting. Usually, an increase or decrease of 1 or 2 units is sufficient to tune the TRK
mode tracking to a particular aircraft / GPS system. After setting the change, or if you want to
bypass this setting, proceed to step 4.
4. Press and release the H MODE button. The arrow
will be placed at the PI (pull in) setting value. This
setting can be adjusted in either the TRK or CRS
mode, but is only used when entering or recovering
from a commanded turn in excess of seven degrees.
5. To change this value, rotate the encoder to the desired setting. Usually, an increase or
decrease of 1 or 2 units is sufficient to tune the PI term to a particular aircraft / GPS system.
After setting the change, or if you want to bypass this setting, proceed to step 6.
6. Press and release the H MODE button.
The SET HNAV GAINS procedure is complete and the encoder can now be used to select another menu
screen.
NOTE: While viewing the calibration screens, you cannot change from the “Track” mode to the “Course”
mode or visa versa. This is because the HMODE 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 PREFERENCES function.
Vertical Navigation Gain
The V NAV system gain settings optimize the Pro Pilot altitude control system vertical 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. However, to achieve
best performance in your airplane the VNAV GAIN SETS adjustment should be optimized.
A gain that is set too high can result in unstable performance (i.e. “porpoising”). A gain that is set too
low will decrease the responsiveness of the system, especially in turbulence.
There are three gain settings on the VNAV GAIN SETS screen.
 The
ALT HLD parameter controls the stability of
the aircraft when in the ALT HLD mode. It will
determine how aggressive the system responds
to turbulence and how tightly it will hold altitude in
a turn.
 The
VS (Vertical Speed) parameter is a separate gain value that may be used to assure that
the aircraft achieves the commanded vertical rate in a climb or descent.
 The
AS (Airspeed) parameter allows gain to be adjusted for smooth operation in a
commanded airspeed climb or descent.