190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 6-1
6 POST INSTALLATION CONFIGURATION AND CHECKOUT
PROCEDURES
6.1 System Configuration Overview
Checkout and configuration instructions for the GTR/GNC is provided in this section.
Configure the GTR/GNC for the specific installation (section 6.4)
Perform the installation checks (section 6.5)
Perform ground checks to verify the interfaces to external sensors (section 6.6)
Perform the specified flight checks (section 6.7)
6.2 Mounting, Wiring, and Power Checks
Connection of the power or lighting bus to incorrect pins can cause damage to the unit,
which will require return to the factory for repair. Always start tests with the dimming bus
at the lowest setting, and slowly increase the brightness. Verify the wiring is correct if it is
noticed the lighting level on the GTR/GNC does not increase as the lighting bus input is
increased in brightness.
Verify 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 cabling
and 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 the
aircraft systems and other avionics equipment. Point to point continuity must be checked to expose any
faults 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 power
distribution to the GTR/GNC. Any faults or discrepancies should be corrected at this time. Remove power
from the aircraft upon completion of the harness checkout.
The GTR/GNC can be installed after completion of the continuity and power checks. The GTR/GNC
should be installed into the rack and secured appropriately, as described in section 4.7.1. The GTR/GNC
must be connected to the wiring harness and antennas.
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