AD 91-14-21
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
Failure of the fixed trailing edge upper panel support beam clips and consequent damage to airplane structure and hydraulic lines.
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Required Actions
Perform a detailed visual inspection for cracks in the fixed trailing edge upper panel support beam clips, replace cracked clips with newly designed or modified clips and spacers, and replace all affected clips within specified landing intervals as per Boeing Service Bulletin 757-57-0027.
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Compliance Time
Prior to the accumulation of 600 total landings or within the next 30 days after the effective date of this amendment, whichever occurs later, and thereafter at intervals not to exceed 600 landings. Replacement must be completed within 3,000 landings after the effective date of this AD.
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Affected Aircraft
Boeing Model 757-200 Series, 757-200CB Series, 757-200PF Series, and 757-300 Series airplanes listed in Boeing Service Bulletin 757-57-0027, Revision 1, with line numbers 1 through 163 excluding 151-150 (specific ranges as outlined in the AD).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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