airworthiness · Rule · Final rule. · Published 2011-12-12 · Effective 2012-01-17 · 76 FR 77107
Document
Document number
2011-31342
Federal Register citation
76 FR 77107
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan
Publication date
2011-12-12
Effective date
2012-01-17
FAA docket
Docket No. FAA-2011-0731
Abstract
We are adopting a new airworthiness directive (AD) for all PW JT9D-7R4H1 turbofan engines. This AD was prompted by reports of cracks in five high-pressure compressor (HPC) shafts. This AD requires removing certain HPC shafts before their certified life limits and establishes a new, lower life-limit for these parts. We are issuing this AD to correct the unsafe condition on these products.