Airworthiness Directive · Amendment 39-18447 · Honeywell International Inc. (Type Certificate Previously Held by AlliedSignal Inc., Garrett Turbine Engine Company) Turbofan Engines
Honeywell International Inc. (Type Certificate Previously Held by AlliedSignal Inc., Garrett Turbine Engine Company) Turbofan Engines
This AD applies to all Honeywell International Inc. (Honeywell) TFE731-4, -4R, -5AR, -5BR, and -5R turbofan engines with an interstage turbine transition (ITT) duct, part number (P/N) 3075292-4, installed, with a serial number (S/N) listed in Table 2 of Honeywell Service Bulletin (SB) TFE731-72-3789, Revision 0, dated March 23, 2015.
We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. (Honeywell) TFE731-4, -4R, -5AR, -5BR, and -5R turbofan engines. This AD was prompted by a report of certain interstage turbine transition (ITT) ducts failing to meet containment capability requirements. This AD requires replacing certain ITT ducts. We are issuing this AD to prevent failure of the ITT duct, which could lead to an uncontained part release, damage to the engine, and damage to the airplane.
(1) At the next removal of the ITT duct from the engine not to exceed 2,600 hours time-in-service after the effective date of this AD, remove the affected ITT duct and replace with a part eligible for installation.
(2) Reserved.
For the purpose of this AD, a part eligible for installation is an ITT duct with an S/N that is not listed in Table 2 of Honeywell SB TFE731-72-3789, Revision 0, dated March 23, 2015 or, if listed in Table 2 of this SB, was reworked using Honeywell SB TFE731-72-3789.
After the effective date of this AD, do not install any ITT duct with an S/N listed in Table 2 of Honeywell SB TFE731-72-3789, Revision 0, dated March 23, 2015, onto any engine, unless the ITT duct is marked with the overhaul/repair instructions number “P35864” near the ITT duct P/N and S/N markings.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
