Summary
We propose to supersede Airworthiness Directive (AD) 2008-06- 18, for all Airbus Model A300 B4-600, B4-600R, and F4-600R series airplanes, and Model A300 C4-605R Variant F airplanes (collectively called Model A300-600 series airplanes) and Model A300 series airplanes. AD 2008-06-18 currently requires repetitive inspections for any cracking of the wing lower skin panel and associated internal support structure, and if necessary, corrective actions such as modifying the lower panel inboard of rib 9 aft of the rear spar and repairing cracks. Since we issued AD 2008-06-18, we have received a report that information from an analysis and fleet survey show a need for reduced compliance times and intervals. This proposed AD would continue to require the existing requirements, and would reduce some compliance times. We are proposing this AD to detect and correct cracking, which could lead to reduced structural integrity of the airplane.