Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus Model A330 and A340 series airplanes. This proposal would require revising the Airplane Flight Manual to include new flight operational procedures for the fuel system; repetitive inspections of the trim transfer fuel line in the vicinity of the aft pressure bulkhead located between frame (FR) 77 and FR86 to detect any discrepancy; and corrective actions, if necessary. This proposal also would require modification of the air release valve in the fuel trim tank transfer system, which would constitute terminating action for the requirements of this AD. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. This action is necessary to prevent damage to the fuel trim transfer system, which could cause rupture of the trim transfer fuel line due to pressure build-up, and result in fuel leakage from that fuel line. This action is intended to address the identified unsafe condition.