Garmin G3X Installation Manual page 740

After a discrete input is configured for either Active Low or Active High, it is assigned to a specific
function. The following discrete input functions are supported:
• User-Defined Alert - Used to display a custom alert on the PFD when the discrete input is active.
Both the message text and the message color can be entered. A red alert will generate an audible
warning tone.
• Canopy Closed - Used with a switch that activates the input when the aircraft canopy is closed and
locked. A solid yellow CANOPY OPEN message will appear on the PFD if the Canopy Closed
input is not active. If engine power is increased or the aircraft is airborne, the CANOPY OPEN
message will flash red and an alert tone will sound.
• Door Closed - Same as Canopy Closed except alert text is DOOR OPEN.
• Gear Down - Used with a switch that activates the input when the aircraft's landing gear is down
and locked. When active, a solid green GEAR DOWN indication is displayed on the PFD. If
inactive, and the aircraft is at a low engine power setting and a low altitude, a red CHECK GEAR
alert message appears and a warning tone sounds continuously. When the aircraft's indicated
airspeed is greater than VFE, VLE, or VLO (whichever is lowest) the CHECK GEAR alert
message will not appear. For turbine engine applications, the CHECK GEAR alert message will
not appear when engine torque is greater than the bottom of the lowest green color band on the
torque gauge.
• Gear Up - Used with a switch that activates the discrete input when the aircraft's landing gear is
fully retracted. A Gear Up input should be used in conjunction with another discrete input that is
configured for the Gear Down function. If neither the Gear Up nor Gear Down inputs are active, a
red GEAR UNSAFE alert will be displayed if the landing gear is in transition (neither fully up nor
fully down).
• Gear Up (Amphib) - Same as the preceding Gear Up configuration, except it also displays a blue
GEAR UP message on the PFD when the gear is confirmed up. This is intended for use in
amphibious aircraft that desire a positive indication of both gear-up and gear-down states.
• Stall Switch - When the input is active, a red flashing STALL message appears on the PFD and a
warning tone sounds continuously. (Audible stall warning tones are inhibited when the aircraft is
on the ground.)
• Squat Switch - Used with a weight-on-wheels switch that activates the input when the aircraft is on
the ground. If a Stall Switch input is also configured, the Squat Switch input will override it (to
reduce nuisance alerting when the stall switch is activated while the aircraft is on the ground). The
Squat Switch input is also used as an additional factor for determining airborne/on-ground status.
• Speed Brake - Used with a switch that activates the input when the aircraft's speed brake is fully
retracted (closed). A white SPEED BRAKE message will appear on the PFD if the Speed Brake
discrete input is not active. If engine power is increased, such as if the speed brake is deployed
during takeoff or climb, the SPEED BRAKE message will flash red and a tone will sound. If the
aircraft has a maximum airspeed limit for speed brake deployment, it can be configured as a
custom reference speed with the label "VSB" (see
setting, if the Speed Brake input is not active and the aircraft's indicated airspeed exceeds VSB, the
SPEED BRAKE message will flash red and a tone will sound.
• AFCS Level - Used in conjunction with the autopilot to activate LVL mode. This input should be
connected to a momentary pushbutton.
• AFCS TO/GA - Used in conjunction with the automatic flight control system (AFCS) flight
director to activate Takeoff or Go-Around mode. This input should be connected to a momentary
pushbutton located near the pilot's throttle control.
190-01115-01 G3X/G3X Touch Install Manual - GDU 45X/46X Config and Post Install Checkout
Rev. AA
Section 32.4.11). Regardless of engine power
Page 32-145