AD 2011-05-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 777-200 | Airworthiness Directives; The Boeing Company Model 777-200, -200LR, -300, and -300ER Series Airplanes |
Unsafe Condition
A Karon-lined bushing with the liner broken into five pieces was found during a scheduled inspection of the horizontal stabilizer trim actuator (HSTA) components; the broken liner had worn and disbonded from the bushing. This could result in reduced structural integrity of the horizontal stabilizer and consequent loss of controllability of the airplane.
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Required Actions
Perform a detailed inspection for disbonding and tearing, and measure the wear of the internal diameter (ID) of the Karon-lined bushings of the bulkhead support jackscrew fitting and of the jackscrew fitting of the horizontal stabilizer. Replace bushings with new ones as applicable. Install either a known serviceable or overhauled HSTA. Perform all applicable related investigative and corrective actions. Repeat the actions at intervals not to exceed 16,000 flight cycles.
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Compliance Time
Before the accumulation of 32,000 total flight cycles, or within 24 months after the effective date of this AD, whichever occurs later.
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Affected Aircraft
The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 777-55A0017, dated May 20, 2010.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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