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Fri, Jan 04, 2008

AD: Pratt & Whitney

AD NUMBER: 2007-26-20
MANUFACTURER: Pratt & Whitney
SUBJECT: Airworthiness Directive 2007-26-20
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.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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