Summary
We propose to supersede Airworthiness Directive (AD) 2015-15- 13, which applies to certain Airbus Model A319 series airplanes; Model A320-211, -212, -214, -231, -232, and -233 airplanes; and Model A321- 111, -112, -131, -211, -212, -213, -231, and -232 airplanes. AD 2015- 15-13 requires modification of the potable water service panel and waste water service panel, including doing applicable related investigative and corrective actions. Since we issued AD 2015-15-13, further investigations linked to widespread fatigue damage (WFD) analysis highlighted that, to meet the WFD requirements, it is necessary that the affected modification not be accomplished before reaching a certain threshold. This proposed AD would require modification of the waste water and potable water service panels with new compliance times. This proposed AD would also remove certain airplanes from the applicability and add Model A320-216 airplanes to the applicability. We are proposing this AD to address theunsafe condition on these products.