AD Amdt-39-11175
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737 | Airworthiness Directives; Boeing Model 737 Series Airplanes |
Unsafe Condition
Cracking found in the PCU secondary servo valve slides could lead to failure of the secondary slide, resulting in rudder hardover and reduced controllability of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and perform repetitive displacement tests of the secondary slide in the dual concentric servo valve of the power control unit (PCU) for the rudder. Replace the valve assembly with a modified valve assembly if necessary.
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Compliance Time
Not specified in the provided text.
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Affected Aircraft
All Boeing Model 737 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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