Due to its unique integrated recever/indicator design, there is not a direct replacement for the KR-86 ADF. Southeast Aerospace recommends upgrading to the KR-87 ADF System. This is more or less a new installation. That is, all KR-86 wiring and cabling will need to be removed. The KR-87 receiver needs to be fitted in the larger KR-86 opening. Panel location for the KI-227 to be determined and the KA-44B replaces the KA-42B antenna on the aircraft.