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Sat, Aug 05, 2006

AD: Pratt & Whitney

AD NUMBER: 2006-16-05
MANUFACTURER: Pratt & Whitney
SUBJECT: Airworthiness Directive 2006-16-05
SUMMARY: The FAA is superseding an existing airworthiness directive (AD) for Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines.

That AD currently requires initial and repetitive torque checks for loose or broken front pylon mount bolts made from INCO 718 material and MP159 material, and initial and repetitive visual inspections of the primary mount thrust load path.

This AD requires the same actions, but at reduced intervals for front pylon mount bolts made from MP159 material. This AD results from analysis by the manufacturer that the MP159 material pylon bolts do not meet the full life cycle torque check interval requirement, in a bolt-out condition.

We are issuing this AD to prevent front pylon mount bolt and primary mount thrust load path failure, which could result in an engine separating from the airplane.

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

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