AD 2012-21-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Fatigue cracks found in Stringer 11 at the outboard flap, inboard drive hinge at Station Xrs=164.000, which could result in the wing structure not supporting the limit load condition, leading to loss of structural integrity of the wing.
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Required Actions
Perform repetitive inspections for cracks in Stringer 11 using in-tank eddy current high frequency (ETHF) inspection. If cracks are found, perform a splice repair before further flight. Conduct post-repair inspections at specified intervals.
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Compliance Time
Within 8,710 flight cycles after the effective date of this AD or before the accumulation of 19,000 total flight cycles, whichever occurs later.
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Affected Aircraft
The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin MD80-57A243, dated December 20, 2011.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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