AD 99-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | International Aero Engines AG (IAE) | V2500-A1 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2522-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2524-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2527-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2527E-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2530-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
| engine | International Aero Engines AG (IAE) | V2533-A5 | Airworthiness Directives; International Aero Engines AG V2500-A1 and V2500-A5 Series Turbofan Engines |
Unsafe Condition
Overheat damage to the high pressure turbine (HPT) hardware caused by ignition of oil that leaked from the No. 4 bearing compartment during an in-flight shutdown (IFSD) and became trapped by the HPT stage 1 inner rotating airseal (TOBI ID seal).
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Required Actions
Determine the need for a special borescope inspection of the HPT TOBI ID seal for oil wetting or overheat damage within five cycles after an IFSD. If necessary, tear down and inspect the HPT module. Replace affected parts with serviceable ones as required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within five cycles after an in-flight shutdown (IFSD)
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Affected Aircraft
International Aero Engines AG V2500-A1 engines (all serial numbers) and V2500-A5 engines with serial numbers V10079 and below.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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