190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 3-2
airspeed is above user-defined limits.
Optional flap limit switches can also be used with the GAD 27, which will cause the flap motor to stop
upon reaching the extreme ends of its travel.
If the flap switch is held longer than 1 second, the flaps will run in the specified direction until the flap
switch is released or the flap limit switch is triggered. This method of manually moving the flaps is not
affected by user-defined airspeed limits. This behavior can also be used in conjunction with a non-
momentary switch in order to fully retract the flaps with a single pilot action. Note that if any of the pre-
programmed flap positions are negative (i.e. "reflexed") the flaps will still stop at the pre-programmed
"zero" position during manual flap retraction.
Aircraft Trim
Aircraft Trim provides trim mixing of pilot and copilot trim switches to provide a combined single
interface to the trim motors or autopilot servos. Switches used on pilot/copilot control sticks do not supply
trim motor power or control relays (just provide ground to discrete inputs) which improves switch
reliability. No external relays are needed, the stick switches can be wired directly to the GAD 27.
Discrete Inputs
Provides 9 additional user configurable discrete inputs (in addition to the 4 provided by the GEA 24).
Lighting Bus Outputs
One to three external panel mounted potentiometers (dimmer controls) can be mapped to any of the six
lighting bus outputs with configurable lighting curves to meet all the typical lighting bus needs of the
aircraft.
There are two types of lighting bus outputs:
• A voltage output which can be used as a reference voltage. This input cannot source current to
drive lights.
• A PWM designed to dim LED or incandescent bulbs.
Light Control with Flashing
Controls up to two external lights using simple low power switches to ground discrete inputs. An
alternating flash (wig-wag) function can either be switch activated or automatically turned on/off based on
a user-selected airspeed.
Voltage Stabilizer
Provides a 12V power bus output to keep essential avionics online during engine start when battery voltage
drops.
3.1.1 Status LED
The GAD 27 has an LED on its outer case that indicates its current status. See Section 31.1.1
for details.
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