Summary
The FAA is adopting a new airworthiness directive (AD) for PW PW4164, PW4168, and PW4168A turbofan engines with certain low pressure turbine (LPT) stage 4 disks, part number (P/N) 51N404, installed. This AD requires removing certain LPT stage 4 disks, listed by serial number at the next piece-part exposure or within 7,500 cycles-since-new (CSN). This AD results from a report of improperly manufactured LPT stage 4 disks. We are issuing this AD to prevent an uncontained engine failure due to low-cycle fatigue (LCF), which could result in damage to the airplane.
Directive Details
AD Number
FAA-2007-27230
Document Number
E7-25505
Type
Rule
Publication Date
January 3, 2008
Effective Date
February 7, 2008
Affected Manufacturer
Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2007-27230
Topics
Official Documents
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