GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
39
Rev. A
Figure A-8: Sensed AOA Fabrication and Installation
When using a two-port pitot tube, a pressure connection (typically using the same tubing
and hardware
that’s used for the pitot connection) is made from the AOA port on the pitot
tube to the AOA port on the pitot-static block. The AOA port on the pitot-static block is the
center port, between the Pitot and Static ports (for instruments equipped with this option).
A-7-2: Calculated AOA Installation
No installation is required, as the angle-of-attack is computed from the AHRS pitch
attitude, true airspeed and vertical speed.
Note
that this method, although not requiring
any sensors or additional pressure connections, degrades in accuracy while in rising or
falling air.
A-7-3: Calibration of the AOA (Calculated and Sensed)
When in flight, in smooth air and at a sufficient altitude to safely stall the airplane, select
“Set Menu – Primary Flight Display.” Near the end of this menu, set “Angle of Attack
(AOA)” to “ON.” New settings will appear below this setting when set to “ON.” We
recommend setting “Pitch Limit Indicator” to “ON,” following this setting is “AOA Pitch
Offset.
” Change this setting to activate the calibration process. Follow the on-screen
prompts. The prompts will include a step where you fly the airplane near stall speed.
When performing this step, minimal power should be used while the flaps should be in
their retracted position.
