AD 99-23-21
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
Operation with an energized sync lock or malfunctioning sleeve locking devices could result in deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.
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Required Actions
Replace the reverse thrust switches and actuators with improved switches and actuators, modify the reverse lever links and thrust control levers, and replace the spring bumper assemblies of the thrust reverser sleeve with improved assemblies in accordance with specified service bulletins.
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Compliance Time
Within 2 years after the effective date of the AD
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Affected Aircraft
Boeing Model 757 series airplanes listed in Boeing Service Bulletins 757-76-0009 (Rev 1) or 757-78-0012, including 757-200, 757-200CB, 757-200PF, and 757-300 series models.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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