Summary
We propose to supersede Airworthiness Directive (AD) 2007-21- 14 R1, for all Airbus Model A310 series airplanes. AD 2007-21-14 R1 currently requires revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new limitations for fuel tank systems. Since we issued AD 2007-21-14R1, we have determined that more restrictive maintenance requirements and/or airworthiness limitations are necessary. 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 loss of the airplane.