AD 2008-13-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes |
Unsafe Condition
Failure or cracking of the PCM manifold in the area of the yaw damper cavity endcap, which could result in an uncommanded left rudder hardover and increased pilot workload, potentially leading to runway departure upon landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracking of the yaw damper actuator portion of the upper and lower rudder power control modules (PCMs). Replace the PCMs if necessary. Install a secondary retention device for the yaw damper modulating piston. Installation of the secondary retention device terminates the repetitive inspection requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of the AD.
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Affected Aircraft
Boeing Model 747-400, 747-400D, and 747-400F series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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