AD 2006-18-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 747-400D, and 747-400F 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, consequent 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
Inspect the yaw damper actuator portion of the upper and lower rudder PCMs for cracking. Replace the PCMs if necessary. Perform repetitive inspections of the PCMs as specified in the AD. Report all inspection results to the manufacturer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 24 months after the effective date of this AD or prior to the accumulation of 56,000 total flight hours or 9,000 total flight cycles, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-400, 747-400D, and 747-400F series airplanes, as specified in the AD and Boeing Service Bulletin 747-27A2397, Revision 2.
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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