AD 2007-17-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 777 | Airworthiness Directives; Boeing Model 777 Airplanes |
Unsafe Condition
Extensive corrosion of a ballscrew in the drive mechanism of the horizontal stabilizer could lead to undetected failure of the primary load path, subsequent wear and failure of the secondary load path, and loss of control of the horizontal stabilizer and airplane.
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Required Actions
Perform repetitive detailed inspections for discrepancies of the horizontal stabilizer trim actuator ballnut and ballscrew, repetitive lubrication of the ballnut and ballscrew, and repetitive measurements of the freeplay between the ballnut and the ballscrew. Replace the actuator with a new or serviceable one if discrepancies are found.
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Compliance Time
Within 180 days or 3,500 flight hours after the effective date, perform a maintenance records check or inspection. Detailed inspections and freeplay measurements must be completed within specified intervals (e.g., before 15,000 total flight hours or 18 months after the effective date for some airplanes).
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Affected Aircraft
All Boeing Model 777 airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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