AD 2014-20-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Hydraulic fluid contamination (in liquid, vapor, and/or solid (coked) form) in the strut forward dry bay could result in hydrogen embrittlement of the titanium forward engine mount bulkhead fittings, leading to inability to carry engine loads and potential engine separation. Hydrogen embrittlement could also cause through-crack formation, allowing engine fire to breach into the strut, resulting in an uncontained strut fire.
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Required Actions
Conduct repetitive general visual inspections of the strut forward dry bay for hydraulic fluid presence. Investigate and correct contamination, including checking drain lines for blockage due to hydraulic fluid coking, and cleaning or replacing drain lines as necessary. Repair conditions using an approved method or data meeting the certification basis of the airplane, approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA).
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Compliance Time
Within the inspection intervals specified in the referenced service information.
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Affected Aircraft
The Boeing Company Model 777-200 and -300 series airplanes, including additional airplanes added to the applicability by this AD.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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