AD 90-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
Unsafe Condition
Loss of hydraulic power due to failure of the ram air turbine to deploy in the event of dual engine failure.
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Required Actions
Replace the ram air turbine deployment actuator in accordance with Arkwin Industries Incorporated Service Bulletin 1211233-29-02. An alternate means of compliance or adjustment of the compliance time may be used when approved by the FAA. Special flight permits may be issued under FAR 21.197 and 21.199.
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Compliance Time
within the next 3,000 hours time-in-service after the effective date of this AD
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Affected Aircraft
Model 757 series airplanes equipped with Arkwin Industries Incorporated part number 1211233-005 ram air turbine deployment actuators with serial numbers 213 through 285
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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