AD 2013-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; the Boeing Company Airplanes |
Unsafe Condition
Non-installation of bushings in the power control actuator (PCA) installation, leading to decreased stiffness of the load path, wear of adjacent parts, and increased freeplay of elevator surfaces. Excessive freeplay could result in divergent flutter for certain maneuvers, potentially leading to loss of controllability.
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Required Actions
Inspect the PCA installation to determine if a bushing is installed. Conduct a general visual inspection between the horizontal stabilizer rear spar and the elevator front spar, and between certain stabilizer stations for defects and damage. Take corrective actions if necessary, either in accordance with an approved method or using data meeting the certification basis of the airplane, approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA).
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-8F and 747-8 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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