Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Rolls-Royce, plc Viper series turbojet engines. This proposal would require a one-time visual inspection of the barometric flow control unit (BFCU) augmentor and bypass valve joint washer for joint washer integrity, and replacement, if necessary, with serviceable parts. This proposal is prompted by a report of a high pressure fuel leak at the BFCU augmentor and bypass valve assembly joint, washer interface. The actions specified by the proposed AD are intended to prevent a high pressure fuel leak, which could result in an engine nacelle fire and damage to the aircraft.