GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
12
Rev. A
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Bluetooth wireless interface to the free GRT Connect Android App.
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3 Additional Serial Ports (3 are Standard)
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Analog Inputs/Audio Output (See Section 2.X: Analog Inputs/Audio Output).
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Basic Engine Monitoring (See Section 2.X: Basic Engine Monitoring
Functions)
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Angle-of-Attack Sensing*
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Touchscreen*
*NOTE:
These optional features require a hardware upgrade and need to be sent in to
GRT in order to add them.
2-6: Analog Inputs/Audio Output
The Sport EX/Horizon EX includes four analog inputs and an audio output as an option.
The analog inputs allow the EFIS to measure up to four individual voltages in the airplane.
Typically, these inputs are used to display the trim and flap positions, but they can be
user-defined for just about any purpose. For example, the inputs may be defined and
used to display fuel levels, fuel pressure, water temperature or even ignition advance (if
compatible with your ignition system).
The audio output provides a method of alerting the pilot when limits are exceeded, gives
altitude call-outs on approach, traffic alerts and much more. The audio output is wired
through the intercom or audio panel.
2-7: Basic Engine Monitoring Functions
Basic engine monitoring provides oil temperature, oil pressure, tachometer, hourmeter
and flight timer. The option is provided with the required sensors. These sensors are
compatible with the GRT Engine Information System (EIS), allowing for a simple
integration of the system in the future. Other engine monitoring can be added using the
optional analog inputs.
Note
that EGT and CHT monitoring cannot be performed via the
analog inputs due to the very small voltages generated by the EGT/CHT probes.
2-8: Loss of GPS Data
While it is expected that the EFIS will be provided with GPS data for accurate navigation
information, it is a possibility that all GPS data could be lost. If this occurs while in flight,
the EFIS will dead-reckon from its last known GPS position. Due to varying winds and
sensor errors, the EFIS system position will degrade in accuracy over time. The intent of
