Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus Model A310 and A300-600 series airplanes. This proposal would require repetitive flow checks of the hydraulic pump drain system to ensure that the system is not clogged, and correction of any discrepancy. This proposal also would require replacement of the existing magnetic seals of the accessory gearbox assembly with new, improved seals. Replacement of certain seals would terminate the requirement for repetitive flow checks. This proposal also would require replacement of the engine drain modules with drain manifolds. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent contamination of the engine accessory gearbox oil with hydraulic fluid, which could result in an in-flight engine shutdown.