AD Amdt-39-11220
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines |
Unsafe Condition
A change in the cooling hole geometry of certain 4th stage low pressure turbine (LPT) disks inadvertently reduced cooling airflow and increased stress levels, potentially leading to an uncontained disk failure and damage to the aircraft.
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Required Actions
Inspect and reduce the life limits of certain 4th stage LPT disks. Alternatively, restore original life limits if reoperation is performed to incorporate the original slotted cooling hole configuration.
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Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney PW4000 series turbofan engines with certain 4th stage LPT disks affected by the altered cooling hole geometry.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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