Airworthiness Directives; Airbus Airplanes

We propose to supersede Airworthiness Directive (AD) 2013-20- 11, for all Airbus Model A318, A319, A320, and A321 series airplanes. AD 2013-20-11 currently requires modifying the passenger emergency oxygen container assembly. Since we issued AD 2013-20-11, we have determined that the unsafe condition also affects oxygen containers labeled ``DAe Systems.'' This proposed AD would expand the affected group of oxygen containers to include those labeled ``DAe Systems.'' We are proposing this AD to prevent a high temperature oxygen generator and mask from falling down and possibly resulting in an ignition source in the passenger compartment, injury to passengers, and reduced availability of supplemental oxygen.