All G1000/G1000 NXi equipped King Air 200 series aircraft that were modified in accordance with MDL 005-00421-00 Rev. 26 and earlier are affected.
Recommended: Garmin recommends the incorporation of this STC Service Bulletin at the next scheduled service interval.
The GTX transponder could go into standby mode when the aircraft is airborne. When in standby mode the transponder does not reply to interrogations. This condition occurs when the following is set:
- throttle idle
- flaps up
- gear up (gear horn active)
- cabin pressure dump activated