Mooney M20D Master — Service Bulletins

This Service Bulletin M20-288, dated June 20, 2005, addresses issues related to alternator wiring specifically for Mooney aircraft equipped with factory-installed optional air conditioning. The bulletin outlines necessary modifications to alleviate heat buildup at the circuit breaker panel interconnect. It is intended for maintenance personnel and owners of affected Mooney models, specifically the M20M and M20R. Compliance is required at the next scheduled annual inspection or within the next 100 flight hours. The document provides detailed instructions for safely performing the modifications, including the removal and re-routing of specific wires, installation of new components, and proper documentation of the work performed.

• Affected models include Mooney M20M (S/N 27-0318 and 27-0326 to 27-0334) and Mooney M20R (S/N 29-0333 to 29-0378).
• Modifications must be completed at the next scheduled annual inspection or within 100 flight hours.
• The procedure involves turning off the master switch, removing the circuit breaker panel, and re-routing specific wires.
• A parts kit (M20-288-000) is required, including a 40-inch harness assembly and nylon grommet.
• Labor for the modifications is warranted for approximately 3 hours by Mooney Airplane Company.