AD 2003-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, -400D, and -400F Series Airplanes |
Unsafe Condition
Cracking in the yaw damper actuator portion of the upper and lower rudder power control modules (PCMs), which could result in an uncommanded left rudder hardover, increased pilot workload, and possible runway departure upon landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Review airplane maintenance records, inspect the yaw damper actuator portion of the upper and lower rudder PCMs for cracking, replace the PCMs if necessary, and report the results of the maintenance records review and inspection to the manufacturer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 3 months after the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-400, -400D, and -400F series airplanes with PCMs that have accumulated 15,000 total flight hours or 2,000 total flight cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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