Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines
airworthiness · Rule · Final rule, request for comments. · Published 2001-03-15 · Effective 2001-03-30 · 66 FR 15024
Document
Document number
01-6300
Federal Register citation
66 FR 15024
Type
Rule
Action
Final rule, request for comments.
Category
airworthiness
Manufacturer
Pratt & Whitney PW4000 Series Turbofan
Publication date
2001-03-15
Effective date
2001-03-30
FAA docket
Docket No. 2000-NE-43-AD
Abstract
This amendment supersedes airworthiness directive (AD) 2000- 25-06, dated December 5, 2000, that is applicable to certain Pratt & Whitney (PW) PW4000 turbofan engines with the current design low pressure turbine (LPT) 4th stage air seal installed. That AD currently requires, based on engine model, replacement of the current design seal with a new design seal, or with a modified seal. This amendment adds the listing of certain engine serial numbers, to correct an error in the applicability section of AD 2000-25-06, for engines affected by PW Service Bulletin (SB) PW4 ENG 72-657, Revision 1, dated July, 19, 2000. This correction is prompted by comments received on AD 2000-25-06. The actions specified by this AD are intended to reduce stresses that could lead to LPT 4th stage air seal cracking, resulting in seal fracture, uncontained engine failure, and damage to the airplane.