Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus Model A310 series airplanes. This proposal would require modification of the wiring for certain hydraulic fire shutoff valves to the right engine to prevent chafing. This proposal is prompted by reports indicating that a circuit breaker to wiring in the right engine had tripped on two airplanes, the cause of which has been attributed to chafing of the associated wire bundle. The actions specified by the proposed AD are intended to prevent this wiring from chafing which, if not corrected, could lead to short circuiting of this wiring and the consequent inability to close the hydraulic fire shutoff valves to the right engine in the event of fire.