AD 97-09-15 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes |
Unsafe Condition
Potential failures within the yaw damper system due to the engage solenoid valve of the rudder power control unit could cause sudden uncommanded yawing of the airplane, leading to injury to passengers and crewmembers.
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Required Actions
Inspect the engage solenoid valve of the yaw damper on the rudder power control unit to determine its part number, and replace the valve with one having a different part number if necessary. Use procedures from the Boeing Maintenance Manual Chapter 22-12-21 or the rudder power control unit Component Maintenance Manual.
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Compliance Time
before further flight
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Affected Aircraft
Boeing Model 737-100, -200, -300, -400, and -500 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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