GTX 320/320A Installation Manual
Page 13
190-00133-01
Rev L
2.8
INSTALLATION USING EXISTING BENDIX/KING KT 76A/78A INSTALLATION
RACK
The GTX 320 and GTX 320A can be used with an existing Bendix/King KT 76A/78A installation rack by using
the KT 76A/78A Installation Adapter (P/N 011-00289-00). See figure B7 for the Bendix/King KT 76A/78A
Adapter assembly drawing.
NOTES
GTX 320 units that are at Mod Level 1 must use the Mod Level 1 Bendix/King KT 76A/78A
Installation Adapter. After Mod Level 1, the GTX 320 sits 0.17" (4.3 mm) closer to the instrument
panel. Also, when installing the GTX 320 in an existing Bendix/King KT 76A/78A rack (using the
KT 76A/78A Adapter) and when the aircraft has a bus voltage of +28 VDC, make sure the +28
VDC dropping resistor is bypassed.
A. Attach the KT 76A/78A installation adapter to the rear of the GTX 320 using the two captive
screws on the adapter.
B.
Looking at the bottom of the transponder, make sure the front lobe of the locking mechanism is in a
vertical position. This can be accomplished by using a 3/32" Allen wrench through the face plate.
C.
Slide the unit into the rack until the front lobe of the unit touches the rack. Guide pins on the back
plate will help in the proper alignment of the unit in the rack.
D. Turn the Allen wrench clockwise until unit is secured in the rack. Continue turning until tight. Do
not overtighten the screw.
E.
To remove the unit from the rack, turn the 3/32" Allen wrench counterclockwise until it disengages
from the rack.
