190-01115-01
G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC
Page 34-163
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.
•
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.
•
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.
•
COM Freq Swap - Used with a GMA 245/245R audio panel and a connected COM radio to swap
the active and standby frequencies on the currently selected COM. The audio panel's selected
microphone channel is used to determine which radio receives the frequency swap command.
•
Door Closed - Same as Canopy Closed except alert text is DOOR OPEN.
•
ESP Inhibit - Used with a switch that activates the input. When in the active state (select active
high or active low), the ESP (Electronic Stability and Protection) function is disabled. See
for ESP configuration details.
•
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.
•
Pitot Temp - Will display a PITOT TEMP caution message on the PFD if the outside air
temperature is below approximately 7°C (45°F) and the input is not active. Configure for Active
Low when used with the regulated GAP 26 (-20 version). See also GAP 26 Alert Configuration
(following).
