Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division and Rolls-Royce (1971) Limited, Bristol Engines Division Viper Series Turbojet Engines

This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce Limited, Bristol Engines Division and Rolls- Royce (1971) Limited, Bristol Engines Division, Viper series turbojet engines, that requires 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 amendment 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 this AD are intended to prevent a high pressure fuel leak, which could result in an engine nacelle fire and damage to the aircraft.