AD 2012-21-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Failure of the bond between the liner and the bushing substrate in the reaction link end cap housing, leading to excessive freeplay in the rudder control surface, which could cause rudder vibration and structural damage severe enough to prevent continued safe flight and landing.
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Required Actions
Review the airplane's maintenance records for each rudder power control unit (PCU) to identify the condition of its related reaction link assembly. Replace the rudder PCU and its related reaction link assembly if necessary, as specified in Boeing Alert Service Bulletin 777-27A0109.
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Compliance Time
Within 48 months after the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 777-200LR and -300ER series airplanes, certificated in any category, identified in Boeing Alert Service Bulletin 777-27A0109, dated December 1, 2011.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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