190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC Page 33-133
Lean Assist
Lean Assist is a feature that monitors and detects peak temperatures for EGT or TIT as the pilot leans the
engine's air/fuel mixture. When configuring EGT or TIT inputs, Lean Assist can be enabled or disabled. If
Lean Assist is enabled, the LEAN softkey will appear on the ENG page in normal mode. Lean Assist
should be disabled for engines that do not have pilot-controllable air/fuel mixture.
Annunciator Outputs
The GEA 24 and GSU 73 have two discrete output pins, which can be used to drive external indicator
lamps. These outputs are optional and do not require any configuration.
DISCRETE OUT 1 acts as a Master Warning annunciator, and is active (pulled low) any time a warning-
level (red) alert is displayed on the PFD.
DISCRETE OUT 2 acts as a Master Caution annunciator, and is active (pulled low) any time a caution-
level (yellow) alert is displayed on the PFD.
See Figure 29-2.2
and Figure 29-3.2 for guidance on wiring indicator lamps to the annunciator output pins.
Engine Power
Estimated engine power can be calculated for Lycoming and Continental engines, using inputs from RPM,
manifold pressure, and fuel flow sensors (all three all required for engine power calculation).
On the Engine Power Configuration page, select the appropriate engine type (Lycoming or Continental,
turbocharged or normally-aspirated). Then enter the engine's maximum rated power and RPM (for
example, 180 horsepower at 2750 RPM). For a turbocharged engine, enter the manifold pressure for
maximum rated power. Configuring maximum manifold pressure is not required for a normally-aspirated
engine, as it is assumed to produce maximum power at sea level pressure.
Engine power is displayed (in percentage) between the RPM and manifold pressure gauges in the EIS
display and on the Engine page.
Figure 33-41 Engine Power Display
The Engine Power item is disabled when a FADEC engine is configured. For FADEC
configurations, engine power or other related status information from the FADEC data
interface (for example, an Economy mode indication) will be displayed if available.
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