Piper PA-42 Cheyenne III — Service Bulletins

This document is a Service Bulletin issued by The New Piper Aircraft, Inc. on September 25, 2000, concerning the inspection and cleaning of Airborne Air Filter Elements. It specifically addresses potential contamination of the gyro vacuum/pressure system due to loose particles from the air filter. The bulletin outlines compliance requirements based on Airborne Service Letter Number 56 and emphasizes the importance of inspecting and cleaning the air filter elements to maintain the reliability of the gyro system. It is applicable to various Piper models, including the Cheyenne III, and provides guidance on compliance procedures and logbook entries.

• This Service Bulletin is effective upon receipt and requires compliance with Airborne Service Letter Number 56.
• Failure to comply may result in contamination of the gyro vacuum/pressure system, affecting reliability.
• Affected models include the PA-31T1, PA-31T2, PA-31T3, and PA-42/42-720 (Cheyenne III/IIIA).
• Operators must inspect and clean the air filter elements as detailed in the service letter.
• A logbook entry must be made after compliance with the Service Bulletin.