GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
9
Rev. A
External autopilots that include their own source of gyro data provide some degree of
redundancy with the AHRS data from the EFIS when the autopilot is coupled. This benefit
is offset by slight transients in pitch when the autopilot is initially coupled to the EFIS. It
also requires more button presses than when GRT servos are used. Since GRT servos
can be mounted in place of TruTrak or Dynon servos, many of our customers choose to
sell their autopilot and install GRT servos; in this instance, the existing mounting kits and
wiring can be used. The required changes to the electrical connections for this switchover
are not difficult to make.
2-2-6: ADS-B Receivers
All ADS-B receivers that provide data in the standard ADS-B format can be wired to the
display unit for weather and traffic data. Most ADS-B receivers provide data in this
standard format, except for some Garmin units. We find the inclusion of ADS-B weather
and traffic to be very beneficial and highly recommend its integration into your airplane
’s
avionics systems. ADS-B receivers can be purchased for as little as a few hundred
dollars.
2-2-7: ADS-B GPS Output
The GPS output from the Sport E
X’s internal GPS is
NOT
FAA 2020 compliant for use
with ADS-B or mode S with extended squitter transponders. If this GPS position data is
used, the FAA will detect that a noncompliant GPS is being used. However, the GRT
Safe-Fly GPS is 2020 ADS-B compliant and is approved by the FAA for this use. This
GPS also includes a serial combiner that provides the EFIS with 3 more serial ports (input
and output). Additionally, this GPS provides accuracy and integrity data that is used by
the Sport EX. The integrity validation performed by this GPS is similar to that performed
by IFR-certified GPS navigators.
2-2-8: Remote Transponders
The Sport EX supports fully remote transponders, including the Trig TT22 and uAvionix
ESX.
These have several advantages over traditional panel-mounted transponders:
•
No panel space is required.
•
The EFIS interface is easy to use.
•
More flexibility in the mounting location.
•
The EFIS can have automated control over the transponder.
•
Multiple display units provide multiple ways to control the transponder.
