GTN Xi systems installed using Approved Model List (AML) Supplemental Type Certificate (STC) SR02120SE are affected.
AML STC SR02120SE
Optional: This STC Service Bulletin may be incorporated at the owner’s discretion and is not warranty reimbursable.
STC SR02120SE GTN 6XX/7XX Part 27 AML STC Master Drawing List Rev. 6 corrects the HTAWS Status Annunciator interconnect.
If installed, wiring changes are required for proper operation of the HTAWS Status Annunciator.