Summary
We propose to supersede Airworthiness Directive (AD) 2007-10- 10 R1, 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). AD 2007-10-10 R1 currently requires revising the airworthiness limitations section (ALS) of the instructions for continued airworthiness (ICA) to incorporate new limitations for fuel tank systems. Since we issued AD 2007-10-10 R1, the manufacturer has issued more restrictive maintenance requirements and/or airworthiness limitations. This proposed AD would require revising the maintenance program or inspection program to incorporate revised fuel maintenance and inspection tasks. We are proposing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors caused by latent failures, alterations, repairs, or maintenance actions, could result in fuel tank explosions and consequent lossof the airplane.