190-01115-01
G3X/G3X Touch Installation Manual - GAD 27 Installation
Rev. AC
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-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
Do not use the GAD 27 in 28V installations.
Flap Controller
The Flap Controller interfaces directly to the flap motor and uses flap position measured by the GEA 24
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 system, it can also prevent flap extension when the
