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Fri, Feb 01, 2008

AD: Honeywell

AD NUMBER: 2008-02-19
MANUFACTURER: Honeywell
SUBJECT: Airworthiness Directive 2008-02-19
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for Honeywell International Inc. (Honeywell) TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR,-20BR, -40, -40AR, -40R, and -60 series turbofan engines.

This AD requires removal from service of certain high pressure (HP) turbine rotor assemblies with part numbers (P/Ns) 3075772-1 and 3060841-1 using a drawdown schedule, and returning them to Honeywell for curvic root radius inspection.

This AD results from the manufacturer's report that some HP turbine rotor discs received improperly machined radii in the root of the forward and aft curvic teeth during manufacture.

We are issuing this AD to prevent uncontained failure of the HP turbine rotor assembly, which could result in damage to the airplane.

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

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