AD 97-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | PW4164 | Airworthiness Directives; Pratt & Whitney PW4164 and PW4168 Series Turbofan Engines |
| engine | Pratt & Whitney Division | PW4168 | Airworthiness Directives; Pratt & Whitney PW4164 and PW4168 Series Turbofan Engines |
Unsafe Condition
Fan blade failure and separation at the root section due to metal fatigue, which could result in high N1 rotor imbalance and liberation of the fan containment system.
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Required Actions
Perform initial and repetitive visual inspections of fan blades (Part Number 55A221) for surface damage and cracks, and lubricate fan blade shrouds per PW SB No. PW4G-100-72-69. Conduct a one-time ultrasonic inspection of the fan blade root attachment area for cracks and a one-time inspection of the front corner radii per PW SB No. PW4G-100-72-81. Remove damaged blades and adjacent blades after bird strikes. Install improved fan blade assemblies by December 31, 1998, per PW SB No. PW4G-100-72-92.
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Compliance Time
Initial inspection at next 'A' check or within 500 hours time in service (TIS) after June 11, 1997, whichever comes first. Repetitive inspections every 'A' check or within 500 hours TIS since last inspection. Install improved fan blade assemblies by December 31, 1998.
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Affected Aircraft
Pratt & Whitney PW4164 and PW4168 series turbofan engines installed on but not limited to Airbus A330 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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