To upgrade from the KCS-55 to the KCS-55A, the KI-525 and KG-102 must be changed to the KI-525A and KG-102A. The mating connectors and racks are the same. However, some pins in the KI harness must be changed to accommodate the KI-525A.

Southeast Aerospace highly recommends upgrading to the KCS-55A. The old KI-525 and KG-102 are not supportable or serviceable. Investing in the more modern KCS-55A system will provide you with a compass system that includes warranty and support for years to come.