Airworthiness Directive · Amendment 39-18654 · International Aero Engines AG Turbofan Engines
International Aero Engines AG Turbofan Engines
This AD applies to International Aero Engines AG (IAE) V2500-A1 turbofan engines with serial numbers listed under Planning Information, Effectivity Data in IAE Non-Modification Service Bulletin (NMSB) V2500-ENG-72-0670, dated March 14, 2016.
We are adopting a new airworthiness directive (AD) for certain International Aero Engines AG (IAE) V2500-A1 turbofan engines. This AD was prompted by a report of an uncontainment caused by a high-pressure turbine (HPT) seal release. This AD requires removing the HPT No. 4 bearing front seal seat, part numbers (P/Ns) 2A0066, 2A1998, and 2A3432, and the HPT No. 4 bearing rear seal seat, P/Ns 2A0067, 2A1999, and 2A3433, and replacing them with parts eligible for installation. This AD also requires inspecting the HPT rotor and stator assembly, and, if necessary, their replacement with parts that are eligible for installation. We are issuing this AD to prevent failure of the HPT stage 2 seals, uncontained HPT seal release, damage to the engine, and damage to the airplane.
(1) Prior to accumulating 500 cycles in service after the effective date of this AD,
(i) Remove the No. 4 bearing front seal seat, part numbers (P/Ns) 2A0066, 2A1998, 2A3432; and the No. 4 bearing rear seal seat, P/Ns 2A0067, 2A1999, 2A3433, and replace with parts eligible for installation.
(ii) Inspect the HPT rotor and stator assembly. Use the Accomplishment Instructions, Part C, paragraph 1.B. of IAE NMSB V2500-ENG-72-0670, dated March 14, 2016 to perform the inspection.
(2) For any parts that fail the inspection required by paragraph (e)(1)(ii) of this AD, before further flight, remove and replace with parts eligible for installation.
