airworthiness · Rule · Final rule; request for comments. · Published 2009-07-08 · Effective 2009-07-23 · 74 FR 32421
Document
Document number
E9-15398
Federal Register citation
74 FR 32421
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Publication date
2009-07-08
Effective date
2009-07-23
FAA docket
Docket No. FAA-2009-0417
Abstract
The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney models PW2037, PW2037(M), and PW2040 turbofan engines. This AD requires 12th stage disks of certain high-pressure compressor (HPC) drum rotor disk assemblies, to be inspected for cracks by Pratt & Whitney using a special eddy current inspection procedure. This AD results from six HPC 12th stage disks found cracked during HPC module disassembly at overhaul. We are issuing this AD to prevent uncontained failure of the HPC 12th stage disk and airplane damage.