AD 2001-07-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | MD-11 | Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes Equipped With Pratt & Whitney Model PW4400 Series Engines |
| engine | Pratt & Whitney | PW4400 Series | Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes Equipped With Pratt & Whitney Model PW4400 Series Engines |
Unsafe Condition
Omission of Section 4B in the AFM's performance correction paragraph could misinform flight crews about operational limits. Additionally, early-production fan blades (Phase 0/1, FB2B) on certain PW4400 series engines may cause a 2.5% thrust shortfall at high-thrust settings, leading to reduced acceleration and climb performance.
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Required Actions
Revise the AFM's Limitations Section to include a reference to required performance corrections in Section 4A or 4B. For airplanes with PW4460 or PW4462 engines with FB2C fans, revise the Performance Section to apply specific weight reduction corrections for various engine configurations.
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Compliance Time
Within 30 days after the effective date of this AD.
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Affected Aircraft
All McDonnell Douglas Model MD-11 series airplanes equipped with Pratt & Whitney Model PW4400 series engines, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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