190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 3-1
3 GAD 27 (FLAPS/LIGHTS/TRIM CONTROLLER) INSTALLATION
This section contains general information as well as installation information for the GAD 27. Use this
section to mount the GAD 27 unit.
Figure 3-1 GAD 27 Unit View
3.1 Equipment Description
The GAD 27 is a small, compact, all solid state (no relays) integrated controller that provides a solution to
many of the typical airframe interfacing needs of G3X™ avionics equipped aircraft. Configuration of the
GAD 27 is conveniently handled through the PFD without requiring the use of a laptop or other external
device. The following is a summary of the functionality provided by the GAD 27.
CAUTION
The GAD 27 is not intended for 28V installations.
Flap Controller
The Flap Controller interfaces directly to the flap motor and uses flap position measured by the GEA™ 24
engine interface module from an external position sensor to support up to 8 pre-programmed flap settings.
The GAD 27 can automatically move the flaps between pre-programmed positions in response to a
momentary press of the flap control switch by the pilot. Each momentary press of the flap switch causes
the flaps to move by one step in the specified direction, stopping at the next pre-programmed position.
For example, Up, Middle, and Down pre-programmed flap positions can be defined. By "bumping" the
momentary flap switch downward, the GAD 27 will automatically move the flaps from the Up position to
the Middle position in the downwind. Similarly, after turning final, the pilot can bump the switch
downward again and the GAD 27 will automatically extend the flaps to the full down position. Since the
GAD 27 receives airspeed from the G3X Touch™ avionics, it can also prevent flap extension when the
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