Garmin GTR 225 Installation Manual

Also see for GNC 255: Pilot's guide

Contents

Garmin GTR 225 Installation Manual Manual pdf 55 page image

190-01182-02 GTR 225/GNC 255 TSO Installation ManualRev. B Page 6-16 POST INSTALLATION CONFIGURATION AND CHECKOUTPROCEDURES6.1 System Configuration OverviewThis section contains instructions for configuring the GTR/GNC for each installation as well as checks toensure the system is properly installed and functioning correctly. A summary of the steps required forconfiguration and checkout of the GTR/GNC is as follows: Perform the installation checks (Section 6.5) Configure the GTR/GNC for the specific installation (Section 6.4) Perform ground checks to verify the interfaces to external sensors (Section 6.6) Perform the specified flight checks (Section 6.7) Update the aircraft documentation (Section 6.9)6.2 Mounting, Wiring, and Power ChecksVerify that all cables are properly secured and shields are connected to the shield block of the connectors.Check the movement of the flight and engine controls to verify there is no interference between the cablingand control systems. Ensure that all wiring is installed as described in Section 3.4.Prior to powering up the GTR/GNC, the wiring harness must be checked for proper connections to theaircraft systems and other avionics equipment. Point to point continuity must be checked to expose anyfaults such as shorting to ground. Any faults or discrepancies must be corrected before proceeding.After accomplishing a continuity check, perform power and ground checks to verify proper powerdistribution to the GTR/GNC. Any faults or discrepancies should be corrected at this time. Remove powerfrom the aircraft upon completion of the harness checkout.The GTR/GNC can be installed after completion of the continuity and power checks. The GTR/GNCshould be installed into the rack and secured appropriately, as described in Section 4.7.1. The GTR/GNCmust be connected to the wiring harness and antennas.CAUTIONWhen 14 VDC or 28 VDC lighting buses are connected to the GTR/GNC, connection ofthe aircraft lighting bus to the incorrect input pins can cause damage to the GTR/GNC.Always start this test with the dimming bus at the lowest setting, and slowly increase thebrightness. If it is noticed that the lighting level on the GTR/GNC does not increase as thelighting bus input is increased in brightness, verify that the wiring is correct beforeproceeding.