Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2017-05-12, which applies to certain Airbus SAS Model A318-112 airplanes, Model A319-111, -112, -115, -132, and -133 airplanes, Model A320-214, -232, and -233 airplanes, and Model A321-211, -212, -213, - 231, and -232 airplanes. AD 2017-05-12 requires a one-time eddy current conductivity measurement of certain cabin, cargo compartment, and frame structural parts to determine if aluminum alloy with inadequate heat treatment was used, and replacement if necessary. Since AD 2017-05-12 was issued, it was determined that aluminum alloy with inadequate heat treatment had been used for additional structural parts. This proposed AD would retain the requirements of AD 2017-05-12, and for certain airplanes, would require additional work, as specified in a European Union Aviation Safety Agency (EASA) AD, which will be incorporated by reference. The FAA is proposing this AD to address the unsafe condition on these products.