airworthiness · Rule · Final rule. · Published 2005-10-25 · Effective 2005-11-29 · 70 FR 61549
Document
Document number
05-21173
Federal Register citation
70 FR 61549
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Rolls-Royce Corporation (Formerly Allison
Publication date
2005-10-25
Effective date
2005-11-29
FAA docket
Docket No. FAA-2005-20742
Abstract
The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (RRC) (formerly Allison Engine Company) 501- D22A, 501-D22C, and 501-D22G turboprop engines. This AD requires a onetime inspection for proper metal hardness of certain 1st stage, 2nd stage, 3rd stage, and 4th stage turbine wheels. This AD results from a report of a turbine wheel found to be over dimensional limits, caused by improper metal hardness. We are issuing this AD to prevent uncontained turbine wheel failure, leading to damage of the airplane and total loss of engine power.