Fri, Feb 01, 2008
AD NUMBER: 2008-02-19
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
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