Airworthiness Directive · Amendment 39-12111 · Airbus Model A330 and A340 Series Airplanes
Airbus Model A330 and A340 Series Airplanes
Model A330 and A340 series airplanes, certificated in any category; fitted with any air pressurization unit ("Pressurization Unit, Air" or "PUA") having part number (P/N) 4020 Q8-3.
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A330 and A340 series airplanes, that requires identifying the part and serial numbers of the pressure reducing valve on each air pressurization unit, testing pressure reducing valves and air pressurization units having affected serial numbers, and replacing faulty valves or units with new parts. The actions specified by this AD are intended to prevent the simultaneous failure of two air pressurization units, which could result in loss of three hydraulic circuits and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.
