GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
2
Rev. A
1-2: Certification
The GRT Sport EX/Horizon EX EFIS is not certified for installation in FAA Type
Certificated Aircraft. It is designed and intended for installation in VFR aircraft licensed as
Experimental or Light-Sport.
1-3: System Description and Architecture
The GRT Sport EX EFIS consists of a panel-mounted Display Unit and an optional
remotely-mounted magnetometer.
The Sport EX and Horizon EX are identical
physically, with the exception that the Horizon EX does not include an internal
Attitude/Heading Reference System (AHRS), air data inputs or internal GPS.
Dimensional drawings for the Sport EX/Horizon EX display units and the magnetometer
are provided in the
Appendix
sections
A-1: Sport EX/Horizon EX Mounting Template
and
A-2: External Module Diagrams
.
The display unit provides a graphical display of primary flight data, moving map/HSI and
engine data. The Horizon EX requires a connection to an external GPS in order to display
flight and navigation data. Both the Horizon EX and the Sport EX require a connection to
a GRT Engine Information System (EIS) Engine Monitor in order to display engine data.
The Sport EX may be operated as a single or multiple screen system. Within each display
unit is a processor, power supply and screen that allow it to process and display
information independent of another EFIS display unit (except for unique data that may be
coming from other display units). This allows multiple screens to provide redundancy.
Multiple screens are normally linked together via a serial inter-display link to share pilot
entries, such as baroset, dimming, flight plan, etc
…
Interfacing to other systems is accomplished via serial ports, and in some cases, the USB
port. The Sport EX is also connected to the aircraft pitot-static system for sensing
airspeed, altitude and vertical speed. The internal AHRS provides roll and pitch attitude
data. When a magnetic heading is provided via the remote magnetometer, the gyro
heading data is also provided. Without the magnetic heading data from the
magnetometer, gyro-stabilized GPS ground track is provided. The GRT AHRS is unique
in the industry in that it can provide attitude data without external aiding from air data or
GPS.
An internal GPS is standard in the Sport EX. Any external GPS may also be used, as long
as its serial data output is in one of the commonly used avionic formats. Most GPS units
will continuously transmit their flight plan, allowing the EFIS to display the flight plan on
its Map and Flight Plan pages. This ability is useful for adding IFR GPS capability to the
Sport system via an IFR-approved GPS.
Note
that only the GPS functions will be
transmitted via a GPS serial output, such as position, ground track, groundspeed, flight
plan, etc
… Other data provided to an external GPS (such as weather) are not displayed
on the GRT EFIS screen (unless this data is also provided to the EFIS, such as weather
