airworthiness · Rule · Final rule; request for comments. · Published 2004-06-22 · Effective 2004-07-07 · 69 FR 34563
Document
Document number
04-14051
Federal Register citation
69 FR 34563
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Publication date
2004-06-22
Effective date
2004-07-07
FAA docket
Docket No. FAA-2004-18024
Abstract
The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce (1971) Limited, Bristol Engine Division (RR) Model Viper Mk.601-22 turbojet engines. This AD requires reducing the life of certain 1st stage turbine rotor blades from 7,000 hours time-in-service (TIS) to 4,600 hours TIS, and provides a drawdown schedule for blades that have already exceeded the new reduced life limit. This AD results from the manufacturer's investigations into failures of 1st stage turbine rotor blades. We are issuing this AD to prevent multiple failures of 1st stage turbine rotor blades that could result in a dual- engine shutdown.