AD 2016-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Accumulation of very fine particle deposits in the power control unit (PCU) electro-hydraulic servo valves (EHSVs) used in the flight control system, causing 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).
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Required Actions
Install markers to allow servicing of hydraulic systems with only HyJet V hydraulic fluid. Perform hydraulic fluid tests of the left, right, and center hydraulic systems, replace the hydraulic system fluid if necessary, and do all applicable related investigative and corrective actions.
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Compliance Time
Within 36 months after the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 787-8 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin B787-81205-SB270026-00, Issue 002, dated June 13, 2016.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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