AD 89-13-04
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
The Takeoff Configuration Warning System (TOCWS) circuitry may cause takeoff configuration false warnings.
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Required Actions
Modify the circuitry of the Takeoff Configuration Warning Systems (TOCWS) in accordance with Boeing Alert Service Bulletin 757-27A0063, Revision 1. An alternate means of compliance or adjustment of the compliance time may be used if approved by the FAA. Special flight permits may be issued under FAR 21.197 and 21.199 to operate airplanes to a base for compliance.
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Compliance Time
within the next 12 months after the effective date of this AD, unless previously accomplished
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Affected Aircraft
BOEING Model 757-200 Series, 757-200CB Series, 757-200PF Series, 757-300 Series airplanes specified in Boeing Alert Service Bulletin 757-27A0063, Revision 1, dated May 17, 1985
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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