Airworthiness Directives; Airbus Airplanes
We propose to supersede Airworthiness Directive (AD) 2010-06- 04, for certain Airbus Model A300 B2-1C, B2-203, B2K-3C, B4-103, B4- 203, B4-2C airplanes; Model A310 series airplanes; Model A300 B4-600 series airplanes; and Model A300 B4-600R series airplanes. AD 2010-06- 04 currently requires repetitive inspections to detect cracks of the pylon side panels (upper section) at rib 8; and corrective actions if necessary. Since we issued AD 2010-06-04, fleet survey and updated fatigue and damage tolerance analyses were done. We have determined that reduced compliance times are necessary. This proposed AD would continue to require repetitive inspections for cracking of the pylons 1 and 2 side panels (upper section) at rib 8 with reduced compliance times, and corrective actions if necessary. This proposed AD would also require repetitive post-repair and post-modification inspections and repair if necessary. This proposed AD would also remove certain airplanes having a certain modification from the applicability. We are proposing this AD to detect and correct cracking of pylon side panels (upper section) at rib 8, which could lead to reduced structural integrity of the pylon primary structure, which could cause detachment of the engine from the fuselage.
Special Conditions: Airbus Model A350-900 airplane; General Limiting Requirements
These special conditions are issued for Airbus Model A350-900 airplanes. These airplanes will have a novel or unusual design feature associated with general limiting requirements of its flight-envelope protection features. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.