Airworthiness Directive · Amendment 39-19604 · Turbine engine combustion section
International Aero Engines AG Turbofan Engines
Superseded. A later AD replaced this one: AD 2021-05-18. Comply with the one in force.
This AD applies to International Aero Engines AG (IAE) V2500-A1, V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, V2533-A5 turbofan engines.
We are adopting a new airworthiness directive (AD) for all International Aero Engines AG (IAE) V2500 turbofan engine models. This AD requires initial and repetitive borescope inspections (BSIs) of the diffuser case M-flange and, if it fails the inspection, replacement of the diffuser case with a part eligible for installation. This AD was prompted by a crack found at the diffuser case M-flange during overhaul inspection. We are issuing this AD to address the unsafe condition on these products.
(1) For diffuser cases with a rear outer flange that is equal to or greater than 20,000 cycles since new (CSN) on the effective date of this AD, perform an initial borescope inspection (BSI) of zones 1, 2, and 3 of the diffuser case M-flange before accumulating the BSI Within (Cycles) listed in Table 1 to paragraph (g)(1) of this AD. Use the Accomplishment Instructions, paragraphs 2.A. through 2.G. for the appropriate engine model, of IAE Alert Non-Modification Service Bulletin (NMSB) V2500-ENG-72-A0706, dated February 14, 2019, to perform the inspection.
(2) For diffuser cases with a rear outer flange that have fewer than 20,000 CSN on the effective date of this AD, perform an initial BSI of zones 1, 2, and 3 of the diffuser case M-flange within 21,300 CSN, in accordance with the Accomplishment Instructions, paragraphs 2.A. through 2.G. for the appropriate engine model, of IAE Alert NMSB V2500-ENG-72-A0706, dated February 14, 2019.
(3) If no cracks are found, perform a repetitive BSI not to exceed every 2,100 cycles since the previous BSI.
(4) If cracks are found, remove the diffuser case and replace with a part eligible for installation or repeat the BSI within the intervals in either Table 2: Fly on Limits or Table 4: Fly on Limits, as appropriate for the affected the engine model, of IAE Alert NMSB V2500-ENG-72-A0706, dated February 14, 2019.
