The GRA 55 leverages Garmin's patent-pending digital signal processing cables that are traditionally required for the installation of radar altimeters.View and Download Garmin GRA 5500 installation manual online. Radar Altimeter. GRA 5500 measuring instruments pdf manual download. Installation of a Garmin GRA 55 or GRA 5500 Radar Altimeter. Please contact modification supplier for further details. STC Status: Issued STC Date: 11/07/14 190-01277-05 GRA 55 Installation Manual. Rev. D Page A INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document may contain information which is subject to Get Garmin GRA 55 PDF manuals and user guides, View all Garmin GRA 55 manuals. Add to My Manuals Save this manual to your list of manuals Page 55 of 0181200 LICENSED NON-BROADCAST AERONAUTICAL TRANSMITTER User DESCRIPTION: Installation Documentation - GRA 5500 Installation Manual AF 2. This document identifies the Instructions for Continued Airworthiness for the modification of the aircraft by the installation of the Garmin GRA 55/5500