Service Letter – INCORRECT SQUAWK CODE WHEN IFD4XX/5XX IS THE CONTROLLER OF THE NGT9000R. [featured_image] Download Download is available until [expire_date] Version Download 518 File Size 145.26 KB File Count 1 Create Date January 4, 2023 Last Updated January 4, 2023 Service Letter - INCORRECT SQUAWK CODE WHEN IFD4XX/5XX IS THE CONTROLLER OF THE NGT9000R.