Garmin G3X - Page 754

190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page A-3
7)
In Air Autopilot
Tuning
The next phase of setting up the Garmin autopilot system is to verify and tune the
proper functionality of the autopilot system in the air.
WARNING
This stage of the flight test involves allowing the GSA 28 autopilot
servos to manipulate the flight control surfaces of the aircraft.
Extreme caution should be used during the initial engagement of the
autopilot system. The pilot should always have easy access to the
autopilot disconnect button to disconnect the autopilot and take
control of the aircraft at any time.
WARNING
All initial autopilot engagement and tuning should be done well
below the maneuvering speed of the aircraft (V
A
) at a sufficient
altitude to allow for aircraft recovery in an emergency situation.
8)
Initial Autopilot
Engagement
The autopilot needs to be engaged and the pitch and roll gains coarsely adjusted so
the Autopilot can roughly maintain straight and level flight.
Engage AP in PIT/ROL Mode and Set Initial Pitch/Roll Gains:
1. Fly the aircraft to a sufficient altitude of 3000 feet AGL or higher
2. Set the aircraft power to maintain straight and level flight with an airspeed
below the maximum maneuvering speed V
A
3. Manually trim the aircraft so it can fly straight and level at this altitude and
airspeed relatively hands off
4. Engage the Autopilot in PIT/ROL mode
5. If there are any pitch or roll oscillations or aggressive responses, disengage
the autopilot
6. Reduce the associated “Pitch Servo Gain” or “Roll Servo Gain” and
reengage the Autopilot in PIT/ROL mode until the aggressiveness is
removed
Table A-1 Flight Test Outline
Task Description