AD 90-26-54
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Uncommanded leading edge flap retraction during takeoff roll.
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Required Actions
Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to add the statement 'Dispatch with an inoperative thrust reverser is prohibited.' An alternate means of compliance or adjustment of the compliance time may be used if approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.
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Compliance Time
Within 10 days after the effective date of this AD, unless previously accomplished.
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Affected Aircraft
All Model 747-400 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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