Garmin G3X Installation Manual page 522

Pitch Gain Configuration
The installer needs to make the following pitch gain configuration selections when setting up the GSA 28
based autopilot system. These selections are made in configuration mode on the PFD under the AP tab and
the pitch gain setup screen in the autopilot setup menu in normal mode.
Table 31-9 Pitch Gain Autopilot Configuration Settings
Configuration
Setting
Min Airspeed Limit
Max Airspeed Limit
Vertical Speed Gain
(advanced setting)
Vertical Accel Gain
(expert setting)
Airspeed Gain
(advanced setting)
Airspeed Accel
Gain
(expert setting)
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AA
The GSA 28 pitch servo has a configurable minimum airspeed limit. This
determines the lowest airspeed the pitch servo will allow the aircraft to fly at. If
the speed drops below this limit, the pitch servo will lower the nose of the aircraft
to keep the airspeed at or above the Min Airspeed Limit.
The Min Airspeed Limit should be set above the aircraft stall speed with some
margin.
The GSA 28 pitch servo has a configurable maximum airspeed limit. This
determines the fastest airspeed the pitch servo will allow the aircraft to fly at. If
the speed rises above this limit, the pitch servo will raise the nose of the aircraft
to keep the airspeed at or below the Max Airspeed Limit.
The Max Airspeed Limit should be set below the aircraft maximum speed with
some margin.
The GSA 28 pitch servo is capable of holding the aircraft at a desired vertical
speed.
The Vertical Speed Gain should be increased if the aircraft struggles to hold the
desired vertical speed target when the flight director is in vertical speed (VS),
altitude hold (ALT), or LVL modes.
The Vertical Speed Gain should be decreased if the aircraft is overly aggressive
when trying to hold the desired vertical speed target.
The GSA 28 pitch servo is capable of holding the aircraft at a desired vertical
speed.
The Vertical Accel Gain should be increased if the aircraft is overshooting the
desired vertical speed target (when the flight director is in vertical speed (VS)
mode) when closing on the bug.
The Vertical Accel Gain should be increased if the aircraft is appears to back off
from the desired vertical speed target when closing on the bug.
The GSA 28 pitch servo is capable of holding the aircraft at a desired airspeed.
The Airspeed Gain should be increased if the aircraft is lazy and struggles to
hold the desired airspeed target when the flight director is in IAS mode.
The Airspeed Gain should be decreased if the aircraft is overly aggressive when
trying to hold the desired airspeed target.
The GSA 28 pitch servo is capable of holding the aircraft at a desired airspeed.
The Airspeed Accel Gain should be increased if the aircraft is overshooting the
desired airspeed target when closing on the bug when the flight director is in IAS
mode.
The Airspeed Accel Gain should be increased if the aircraft is appears to back
off from the desired airspeed target when closing on the bug.
Description
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