Airworthiness Directive · Amendment 39-9440 · Airbus Airplanes
Airbus Airplanes
This AD applies to Airbus A320-111, A320-211, A320-212, A320-214, A320-231, A320-232, A320-233.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A320 series airplanes, that requires replacement of the check valves of the thrust reverser with modified valves on certain airplanes and the replacement of the manual control valves of the thrust reverser with modified valves on certain other airplanes. This amendment is prompted by recent engineering analysis, which revealed that, if the non-return valve installed on the hydraulic return line of the thrust reverser were to jam in the closed position, it could cause pressurization of the Hydraulic Control Unit (HCU). The actions specified by this AD are intended to prevent such pressurization of the HCU due to jamming of the non-return valve in the hydraulic return line, and consequent deployment of a thrust reverser during flight; this condition, if not corrected, could adversely affect the controllability of the airplane.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
