Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce (1971) Limited, Bristol Engine Division (RR) Viper Mk. 601- 22 turbojet engines. This proposed AD was prompted by a review carried out by RR of the lives of certain critical parts. This proposed AD would require reducing the life of these parts. We are proposing this AD to prevent life-limited part failure, damage to the engine, and damage to the airplane.