airworthiness · Rule · Final rule; request for comments. · Published 2012-12-10 · Effective 2012-12-26 · 77 FR 73268
Document
Document number
2012-29489
Federal Register citation
77 FR 73268
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Rolls-Royce plc Turbofan
Publication date
2012-12-10
Effective date
2012-12-26
FAA docket
Docket No. FAA-2012-1117
Abstract
We are adopting a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211-Trent 900 series turbofan engines. This AD requires inspection of the low pressure turbine (LPT) bearing housing end cover assembly in certain engines and, if necessary, its replacement. This AD was prompted by a Trent 900 engine experiencing a high intermediate pressure vibration fault, along with other fluctuating engine parameters, while in flight. We are issuing this AD to prevent fracture of the oil transfer tube, which could result in uncontained failure of the engine and damage to the airplane.