AD 2011-25-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | International | Aero | Airworthiness Directives; International Aero Engines Turbofan Engines |
Unsafe Condition
Reports of high-pressure turbine (HPT) case burn-through events, loss of stage 1 blade outer air seal segments, and HPT case bulging indicate potential degradation leading to HPT case burn-through, uncontrolled under-cowl engine fire, and damage to the airplane.
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Required Actions
Initial and repetitive 360-degree borescope inspections of HPT stage 1 blade outer air seal segments for evidence of distress conditions. Incorporation of improved durability stage 1 blade outer air seal segments at the next exposure to the HPT module subassembly as terminating action to the repetitive inspections.
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Compliance Time
Within 12 months of effective date (January 17, 2012).
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Affected Aircraft
International Aero Engines (IAE) V2500-A1, V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533-A5 turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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