Airworthiness Directive · Amendment 39-18640 · International Aero Engines AG Turbofan Engines
International Aero Engines AG Turbofan Engines
This AD applies to International Aero Engines AG (IAE) V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533-A5 engines with either of the following installed:
(1) High-pressure turbine (HPT) stage 1 hub, part number (P/N) 2A5001, with a serial number (S/N) listed in Table 1, Appendix A, of IAE Non-Modification Service Bulletin (NMSB) V2500-ENG-72-0661, Revision 2, dated May 27, 2016; or
(2) HPT stage 2 hub, P/N 2A4802, with an S/N listed in Table 2, Appendix A, of IAE NMSB V2500-ENG-72-0661, Revision 2, dated May 27, 2016.
We are adopting a new airworthiness directive (AD) for certain International Aero Engines AG (IAE) V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533-A5 turbofan engines. This AD was prompted by the fracture of the high- pressure turbine (HPT) stage 2 hub during flight, which resulted in an in-flight shutdown (IFSD), undercowl fire, and smoke in the cabin. This AD requires inspecting the HPT stage 1 hub and HPT stage 2 hub, and, if necessary, their replacement with parts that are eligible for installation. We are issuing this AD to prevent failure of the HPT stage 1 or HPT stage 2 hubs, which could result in uncontained HPT blade release, damage to the engine, and damage to the airplane.
(1) Inspect the HPT stage 1 hub, P/N 2A5001, and HPT stage 2 hub, P/N 2A4802, at the next shop visit or as follows, whichever comes first:
(i) For hubs with 0 to 7,000 CSN on the effective date of this AD, before accumulating 13,000 CSN;
(ii) For hubs with 7,001 to 11,000 CSN on the effective date of this AD, within 6,000 cycles from the effective date of this AD or before accumulating 15,000 CSN, whichever occurs first;
(iii) For hubs with 11,001 to 15,500 CSN on the effective date of this AD, within 4,000 cycles from the effective date of this AD or before accumulating 17,000 CSN, whichever occurs first;
(iv) For hubs with 15,501 CSN or more on the effective date of this AD, within 1,500 cycles from the effective date of this AD.
(2) Use Accomplishment Instructions, paragraphs 2.A., 2.C., and 2.D., of IAE NMSB V2500-ENG-72-0661, Revision 2, dated May 27, 2016, to inspect the HPT stage 1 hub, P/N 2A5001.
(3) Use Accomplishment Instructions, paragraphs 2.E., 2.G., and 2H., of IAE NMSB V2500-ENG-72-0661, Revision 2, dated May 27, 2016 to inspect the HPT stage 2 hub, P/N 2A4802.
(4) Remove from service any HPT stage 1 hub, P/N 2A5001, or HPT stage 2 hub, P/N 2A4802, that fails the inspections required by paragraphs (e)(2) and (e)(3) of this AD, and replace with a part that is eligible for installation.
For the purpose of this AD, a “shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine flanges, except that the separation of engine flanges solely for the purposes of transportation without subsequent engine maintenance does not constitute an engine shop visit.
