Garmin GRA 55 Maintenance Manual - Page 13

Gra 55/5500 Control And Operation

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3 GRA 55/5500 CONTROL AND OPERATION 3.1 Control, Operating, and Testing Information The GRA 55/5500 is a fully automated, remote-mounted LRU which requires no user controls or inputs. The GRA 55/5500 displays the radar altitude height above ground level on compatible display systems. Radar altitudes will be displayed ranging from ground level to 2550ft AGL. The GRA 55/5500 has a built-in self-test (BIST/BITE) and fault logging functionality which includes automated self-test and fault detection monitoring of the entire internal TX and RX circuitry. This feature occurs every time the unit power is cycled and subsequently every minute during normal operation at calculated altitudes ranging from 250ft to 2550ft AGL and during "No Computed Data" (NCD) conditions. The GRA 55/5500 will encounter NCD conditions; at actual altitudes above 2550ft AGL, during excess pitch or roll maneuvering, or anytime the ground reflection is poor. 3.2 Downloading and Installing the GRA 55/5500 Retrofit Installation Tool GRA 55/5500 configuration, calibration, diagnostics, and software upgrades are performed using a personal computer (installed with Microsoft Windows XP Service Pack 3 or later) and the GRA 55/5500 Retrofit Installation Tool, Garmin part number 006-A0451-00. The tool is available for download from the Dealer Resource Center portion of the Garmin website (www.garmin.com). See the accompanying "readme" file in the tool's installation directory for the latest instructions. NOTE A standard USB-A plug to USB-B plug commercial cable (not provided) is required to interface between a personal computer USB-A receptacle and the GRA 55/5500 USB-B receptacle installed in the wiring harness. This dongle cable is required to use the GRA 55/5500 Retrofit Installation Tool. Installation 1. Once downloaded, launch the installation file from the directory in which it is stored (or use the web browser's download shortcuts). 2. The GRA 55/5500 Retrofit Installation Tool Setup Wizard will begin. 3. Click "Next" as prompted by the setup wizard, and adjust any settings (e.g. installation directory) as needed. 4. The last screen of the setup wizard will show "Installation Complete." Click the "Close" button to close the setup wizard. 190-01277-A3 Rev. 1 System Maintenance Manual GRA 55/5500 Bell 206 STC Page 3-1

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190-01277-A3
System Maintenance Manual GRA 55/5500 Bell 206 STC
Rev. 1
Page 3-1
3
GRA 55/5500 CONTROL AND OPERATION
3.1
Control, Operating, and Testing Information
The GRA 55/5500 is a fully automated, remote-mounted LRU which requires no user controls or inputs.
The GRA 55/5500 displays the radar altitude height above ground level on compatible display systems.
Radar altitudes will be displayed ranging from ground level to 2550ft AGL.
The GRA 55/5500 has a built-in self-test (BIST/BITE) and fault logging functionality which includes
automated self-test and fault detection monitoring of the entire internal TX and RX circuitry. This feature
occurs every time the unit power is cycled and subsequently every minute during normal operation at
calculated altitudes ranging from 250ft to 2550ft AGL and during “No Computed Data” (NCD) conditions.
The GRA 55/5500 will encounter NCD conditions; at actual altitudes above 2550ft AGL, during excess
pitch or roll maneuvering, or anytime the ground reflection is poor.
3.2
Downloading and Installing the GRA 55/5500 Retrofit Installation Tool
GRA 55/5500 configuration, calibration, diagnostics, and software upgrades are performed using a
personal computer (installed with Microsoft Windows XP Service Pack 3 or later) and the GRA 55/5500
Retrofit Installation Tool, Garmin part number 006-A0451-00. The tool is available for download from the
Dealer Resource Center portion of the Garmin website (www.garmin.com). See the accompanying
“readme” file in the tool’s installation directory for the latest instructions.
NOTE
A standard USB-A plug to USB-B plug commercial cable (not provided) is required to
interface between a personal computer USB-A receptacle and the GRA 55/5500 USB-B
receptacle installed in the wiring harness. This dongle cable is required to use the GRA
55/5500 Retrofit Installation Tool.
Installation
1.
Once downloaded, launch the installation file from the directory in which it is stored (or use the
web browser’s download shortcuts).
2.
The GRA 55/5500 Retrofit Installation Tool Setup Wizard will begin.
3.
Click “Next” as prompted by the setup wizard, and adjust any settings (e.g. installation directory)
as needed.
4.
The last screen of the setup wizard will show “Installation Complete.” Click the “Close” button to
close the setup wizard.