AD 2023-05-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
fatigue or cracking of the RAT hydraulic pump bronze cylinder block, which can result in failure of the RAT pump and subsequent loss of backup hydraulic power for the flight controls, leading to loss of continued safe flight and landing.
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Required Actions
an inspection or records review to determine the part number of the RAT pump and control module (PCM) and of the RAT assembly, and replacement of any RAT PCM or any RAT assembly having certain part numbers.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 787-8, 787-9, and 787-10 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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