GRT Avionics HXr Installation Manual
Revision A -5 2-20
and our EFIS is equally happy with once per second update rates as it is with five per second, so
the default settings are acceptable.
To configure the GPS, set the serial output to 9600 baud, and use the "GPS NMEA Configuration"
serial output selection.
2.4 Cooling Considerations
The GRT Horizon HXr EFIS does not require external cooling. However, as with all electronic
equipment, lower operating temperatures extend equipment life. Units in an avionics stack heat
each other through radiation, convection and sometimes by direct conduction. Even a stand-
alone unit operates at a higher temperature in still air than in moving air. The Horizon HXr contains
an internal cooling fan. Be sure that there is adequate air available so that it can cool the display
unit. A few openings in the glare shield are usually more than adequate to allow natural air flow.
If external forced air is used, be certain that the cooling air does not contain water – a problem
often encountered when using external air.
2.5 Pitot/Static Connections
The AHRS contains the Air Data Computer. The ADC requires connection to the aircraft pitot static
system. Connections on the AHRS unit take a 1/8 – 27 NPT male fitting. Connections and the entire
pitot static system must be leak tight. Refer to AC 43.13.1B for approved methods to achieve this.
