AD 2007-03-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737 | Airworthiness Directives; Boeing Model 737 Airplanes |
Unsafe Condition
Failure of one of the two input control rods of the main rudder power control unit (PCU), which could result in reduced controllability of the airplane; and failure of any combination of two input control rods of the main rudder PCU and/or standby rudder PCU, which could cause an uncommanded rudder hardover event and result in loss of control of the airplane.
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Required Actions
Install a new rudder control system and make changes to adjacent systems. Perform repetitive tests of the force fight monitor of the main rudder PCU and the standby hydraulic actuation system, followed by corrective action. Replace both input control rods of the main rudder PCU and the input control rod of the standby rudder PCU with new input control rods. For certain airplanes, install an enhanced rudder control system in accordance with new service information.
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Compliance Time
Before further flight
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Affected Aircraft
All Boeing Model 737 airplanes, with specific actions depending on the configuration and service history of the airplane.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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