Airworthiness Directives; Boeing Model 767-200 and -300 Series Airplanes

The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 767 series airplanes. That AD currently requires repetitive detailed and eddy current inspections of the aft pressure bulkhead for damage and cracking, and repair if necessary. This new AD also requires one-time detailed and high frequency eddy current inspections of any ``oil-can'' located on the aft pressure bulkhead, and related corrective actions if necessary. An ``oil-can'' is an area on a pressure dome web that moves when pushed from the forward side. This AD is prompted by reports of cracking at ``oil-can'' boundaries on the aft pressure bulkhead. We are issuing this AD to detect and correct fatigue cracking of the aft pressure bulkhead, which could result in rapid depressurization of the airplane and possible damage or interference with the airplane control systems that penetrate the bulkhead, and consequent loss of controllability of the airplane.