Pilot's Guide

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The GI 205 performs the following functions:
Receive and process ARINC Label 164
Visual and aural annunciations
Decision Height alert discrete output
Activate Self Test mode in GRA 55/5500
Display Radar Altitude (Meters/Feet)
Auto adjust the brightness of the display
Volume control
Enable/Disable Altitude Trend
Various parameters can be configured by the installer (not pilot accessible):
Altitude Filter Time Constant
Maximum Trend Scale
Trend Filter Time Constant
DH Display Name
DH Visual Alert
DH Aural Alert
Default Decision Height
ARINC 429 Speed
Select Rounding Options
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The GI 205 interfaces with Garmin GRA 55 and GRA 5500 radar altimeters via ARINC
429 interface.
Inhibit DH Input: If this discrete input is connected to ground, the decision height
functionality is masked from the display.
GRA Altitude Alert Discrete Input 1: If this discrete input is connected to the GRA 55 or
GRA 5500, the GI 205 provides a visual and aural annunciation when the input is active.
GRA Altitude Alert Discrete Input 2: If this discrete input is connected to the GRA 55 or
GRA 5500, the GI 205 provides a visual and aural annunciation when the input is active.
Aircraft power is the only electrical power interface.
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