airworthiness · Rule · Final rule; request for comments. · Published 2012-09-14 · Effective 2012-10-01 · 77 FR 56760
Document
Document number
2012-21286
Federal Register citation
77 FR 56760
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Rolls-Royce plc Turbofan
Publication date
2012-09-14
Effective date
2012-10-01
FAA docket
Docket No. FAA-2012-0848
Abstract
We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-Trent 800 series turbofan engines. This AD requires removing from service certain intermediate pressure (IP) turbine discs that have a serial number listed in this AD. This AD was prompted by RR performing an evaluation that determined that the current lives for certain IP turbine discs with a steel inclusion may fail before they reach their current mandatory life limits. We are issuing this AD to prevent failure of the IP turbine disc, which could result in uncontained failure of the engine and damage to the airplane.