Airworthiness Directive · Amendment 39-17897 · 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. TFE731-4, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, -40BR, -50R, and -60 turbofan engines with 2nd stage low-pressure turbine (LPT2) blades, part number (P/N) 3075424-1, -2, or -3, installed.
We are superseding emergency airworthiness directive (AD) 2014-12-52 for all Honeywell International Inc. TFE731-4, -4R, -5AR, - 5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, -40BR, -50R, and -60 turbofan engines. Emergency AD 2014-12-52 was sent previously to all known U.S. owners and operators of these engines. AD 2014-12-52 required, before further flight, a review of the engine logbook maintenance records to determine if any affected engines are installed. AD 2014-12-52 also prohibited operation of an airplane with two or more affected engines that have 2nd stage low-pressure turbine (LPT2) blades with less than 250 operating hours since new. This AD retains the requirements of AD 2014-12-52 and clarifies the intent of the mandatory requirements. This AD was prompted by reports of LPT2 blade separations. We are issuing this AD to prevent LPT2 blade failure, multiple engine in-flight shutdowns, and damage to the airplane.
(1) Before further flight, review engine logbook maintenance records to determine if any engine is installed that has LPT2 blade, P/N 3075424-1, -2, or -3, installed with less than 250 operating hours since new on the blade.
(2) For two-engine airplanes that have two engines with LPT2 blades installed that have less than 250 operating hours since new, remove all affected engines before further flight.
(3) For three-engine airplanes that have two or more engines with LPT2 blades installed that have less than 250 operating hours since new, remove all affected engines before further flight.
(4) After the effective date of this AD, do not install any engine that has installed in it LPT2 blades, P/N 3075424-1, -2, or -3, that have less than 250 operating hours since new.
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.
