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Tue, Dec 20, 2016

AD: The Boeing Company Airplanes

AD NUMBER: 2016-25-02

PRODUCT: Certain Boeing Model 787-8 airplanes.

ACTION: Final Rule

SUMMARY:  This AD was prompted by reports of the accumulation of very fine particle deposits in the power control unit (PCU) electro-hydraulic servo valves (EHSVs) used in the flight control system; this accumulation caused degraded performance due to reduced EHSV internal hydraulic supply pressures, resulting in the display of PCU fault status messages from the engine indication and crew alerting system (EICAS).

This AD requires installing markers to limit the hydraulic system fluid used to a specific brand, doing hydraulic fluid tests of the hydraulic systems, replacing hydraulic system fluid if necessary, and doing all applicable related investigative and corrective actions.

The FAA is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective January 20, 2017.

FMI: AD

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