AD/PA-32/33 - Air Conditioning System - Modification - CANCELLED

This document officially cancels a safety rule that previously required owners of Piper PA-32 Cherokee Six aircraft (a six-seat light aircraft) to modify their air conditioning systems.

What the rule used to require:

• Owners had to modify any factory-installed air conditioning system according to Piper Service Bulletin No. 427
• The work had to be completed within 100 hours of flying time after October 1974

What changed: This directive is completely cancelled as of 25 September 2008. Aircraft owners and maintenance engineers no longer need to perform this specific air conditioning modification to keep the aircraft legally airworthy.

Who needs to know: Owners, operators, and maintenance engineers of Piper PA-32 series aircraft. While this specific requirement is dead, other safety and maintenance rules still apply to these aircraft.