Airworthiness Directive · Amendment 39-9747 · Piaggio Model P-180 Airplanes
Piaggio Model P-180 Airplanes
Model P-180 airplanes; equipped with Allied Signal outflow/safety valves, as specified in Allied Signal Aerospace Service Bulletins 103742-21-4059 and 103744-21-4060, both dated March 31, 1995; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Piaggio Model P-180 airplanes, that requires replacement of outflow/safety valves with serviceable valves. This amendment is prompted by a report of cracking and subsequent failure of outflow safety valves in the pressurization system. The actions specified by this AD are intended to prevent such cracking and subsequent failure of the outflow/safety valves, which could result in rapid decompression of the airplane.
