AD 2013-11-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Hydraulic fluid contamination (including contamination caused by hydraulic fluid in its liquid, vapor, and/or solid (coked) form) found in the strut forward dry bay, which could result in hydrogen embrittlement of the titanium forward engine mount bulkhead fittings, and consequent inability of the fittings to carry engine loads, resulting in engine separation. Hydraulic embrittlement also could cause a through-crack formation across the fittings through which an engine fire could breach into the strut, resulting in an uncontained strut fire.
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Required Actions
Repetitive general visual inspections of the strut forward dry bay for the presence of hydraulic fluid. Related investigative and corrective actions, including checking drain lines for blockage due to hydraulic fluid coking, and cleaning or replacing drain lines to allow drainage, if necessary.
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Compliance Time
Within 50 flight hours after the effective date of the AD.
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Affected Aircraft
The Boeing Company Model 777-200 and -300 series airplanes with Pratt & Whitney PW4000 series engines, specifically those that have accumulated approximately 9,900 to 29,000 flight cycles and 13,000 to 33,300 flight hours.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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