190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-9
30.4.6 LRU Configuration Page
The LRU configuration page is used to configure which optional Garmin LRUs are connected to the
system. If a particular LRU is not installed, or a particular LRU function (such as AOA) is not desired,
change that setting on the LRU configuration to "Disabled".
For example, if a GSU 25 is connected as ADAHRS 2 but no GTP 59 is connected to that GSU 25,
configure ADAHRS 2 to "Enabled" and OAT 2 to “Disabled”. Only enable Magnetometer 2 if a second
GMU 11 is installed.
Also change any AOA item to “Disabled” if the installed ADAHRS LRU does not support AOA (e.g the
GSU 73) or if the AOA pneumatic connection is not connected to that ADAHRS LRU.
The Engine Interface item is used to configure which numbered EIS LRU(s) should be used. Typically this
should be left configured for EIS1 only, except in the case of a system that includes a GSU 73 and a
GEA™ 24 engine interface module, the latter of which would be wired as EIS2. In a system that includes
dual GEA 24 units used to monitor twin engines or large single engines, select "Use EIS 1+2" to enable the
use of both EIS LRUs.
The “Garmin Autopilot Servos” item is used to configure how many GSA 28 servos are installed. Select
"Roll Only" if a single roll servo is installed, "Pitch + Roll" for a two-axis autopilot servo installation.
Enable Roll Trim Servo or Pitch Trim Servo only if a Garmin GSA 28 autopilot servo is installed as a
dedicated trim motor. For this to be enabled, one GSA 28 must be installed per axis for primary autopilot
control, a second GSA 28 would then be installed as a trim motor. If the primary autopilot servo is directly
driving a 3rd party trim motor using pins 13 and 14 of the GSA 28, this field should be set to “Disabled”.
Enable Radio AGL only if a Garmin GHA 15 Height Advisor is installed. If an ARINC 429 Radar
Altimeter is installed, leave this setting Disabled.
1. In configuration mode (Section 30.2
), use the Touch Panel or a Move Selector Knob to select and
view the LRU Page.
2. Use the Touch Panel or a Move Selector Knob to select, then enable or disable the listed LRUs.
3. Press the Back key to return to the Configuration Mode page when finished (if desired).
For configurations with no ADAHRS LRUs:
1. Set ADAHRS 1 to Disabled.
2. An option to enable/disable "Standby Flight Displays" is displayed.
3. Set "Standby Flight Displays" to enabled if there is a G5 (or multiple G5 units) installed in the
G3X Touch system,
4. Configuration settings that are applicable only to systems with a source of attitude data (autopilot,
etc) will be displayed.
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