AD 2001-01-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 747-400F, 767-200, and 767-300 Series Airplanes Equipped With Pratt & Whitney Model PW4000 Series Engines |
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Boeing Model 747-400, 747-400F, 767-200, and 767-300 Series Airplanes Equipped With Pratt & Whitney Model PW4000 Series Engines |
Unsafe Condition
Erosion of the fan blade's leading edge on early-production fan blades (Phase 0/1, FB2B or FB2T) installed on Pratt & Whitney Model PW4000 series engines, resulting in reduced thrust and consequently reduced acceleration and climb performance relative to performance data in the Airplane Flight Manual (AFM).
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Required Actions
Revise the Airplane Flight Manual (AFM) to include performance adjustments for Model 747-400, 747-400F, 767-200, and 767-300 series airplanes equipped with Pratt & Whitney Model PW4000 series engines, addressing the potential for future installation of early-production fan blades (Phase 0/1, FB2B or FB2T).
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Compliance Time
Within 30 days after the effective date of this AD.
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Affected Aircraft
Boeing Model 747-400, 747-400F, 767-200, and 767-300 series airplanes equipped with Pratt & Whitney Model PW4000 series engines, regardless of modification, alteration, or repair status.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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