airworthiness · Rule · Final rule. · Published 2012-07-10 · Effective 2012-08-14 · 77 FR 40479
Document
Document number
2012-16797
Federal Register citation
77 FR 40479
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Rolls-Royce Corporation Turboshaft
Publication date
2012-07-10
Effective date
2012-08-14
FAA docket
Docket No. FAA-2011-0961
Abstract
We are adopting a new airworthiness directive (AD) for certain Rolls-Royce Corporation (RRC) 250-C20, -C20B, and -C20R/2 turboshaft engines. This AD was prompted by seven cases reported of released turbine blades and shrouds, which led to loss of power and engine in- flight shutdowns (IFSDs). This AD requires a one-time visual inspection and fluorescent penetrant inspection (FPI) on certain 3rd and 4th stage turbine wheels for cracks in the turbine blades. We are issuing this AD to prevent failure of 3rd or 4th stage turbine wheel blades which could cause engine failure and damage to the airplane.