Airworthiness directives › 2008-19-12
AD 2008-19-12 Airworthiness Directives; Honeywell International Inc. TFE731-4, -4R, -5, -5AR, -5BR, and -5R Series Turbofan Engines
Applicability*9
This AD applies to Honeywell International Inc. TFE731-4, -4R, -5, -5AR, -5BR, and -5R series turbofan engines, with interstage turbine transition (ITT) duct, part number (P/N) 3075292-1; 3075292-3; 3074766-1; 3077063-1; 3075655-1; 3075655-2; 3075699-1; or 3075699-3, installed. These engines are installed on, but not limited to, Avions Marcel Dassault Mystere-Falcon 50 series, Dassault-Aviation 20, 50, 900, MF900 series, Cessna Model 650, Cessna Citation VII, and Raytheon Corporate Jets (formerly British Aerospace) Hawker 800 and 850XP series airplanes.
Compliance
You are responsible for having the actions required by this AD performed at the next Major Periodic Inspection of the engine or at next access of the ITT duct, whichever occurs first, but not to exceed 2,600 hours time-in-service after the effective date of this AD, unless the actions have already been done. Replacement of the ITT Duct (f) Replace the affected ITT ducts listed by part number in paragraph (c) of this AD, with a serviceable and redesigned ITT duct. Definitions (g) For the purpose of this AD, a serviceable and redesigned ITT duct is one not having a part number listed in this AD. (h) For the purpose of this AD, next access of the ITT duct is when the ITT duct is removed from the engine. Prohibition of Affected ITT Ducts (i) After the effective date of this AD, do not install any ITT duct listed by P/N in paragraph (c) of this AD, onto any engine. Alternative Methods of
Unsafe condition
This AD results from reports of 49 low-pressure turbine (LPT) blade separation events. Six of those events resulted in circumferential failure of the LPT2 or LPT3 nozzle assembly, leading to deformation of the ITT duct and uncontainment of the turbine blades and fragments of the LPT nozzle assembly. We are issuing this AD to prevent uncontainment of turbine blades and fragments of the LPT nozzle assembly, which could result in damage to the airplane.
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