The quality and reliability of the KNI-582 indicator is greatly affected by the age of the unit. Older units develop cracks in the gear plate and/or contain compass card motors that are no longer available from Bendix/King Honeywell. KNI-582 Service Aid 102 addresses the replacement of the existing compass card motor with a new style motor. In order to replace the older style DC motor (P/N 148-05051-0000), you must also replace other parts such as the gear plate since the newer style motor is physically different. The approximate cost of performing Service Aid 102 for the KNI-582 is $1000.
When a cracked motor plate is encountered, some shops opt to try and repair the plate by gluing it instead of replacing it. Likewise, you may encounter KNI-582 units with loud compass card motors. Once again, some shops may certify the unit with a loud motor to avoid the expense of replacing the old style motor according to Service Aid 102 as mentioned above. As expected, a loud compass card motor is a sign of an older motor that is wearing out or even possibly not working as it should.
According to our purchasing and service quality standards, Southeast Aerospace always performs Service Aid 102 as not only the correct repair action but as preventative measure as well. Remember, if you are purchasing a KNI-582 with a low serial number, always inquire if Service Aid 102 has been performed on the unit.