AD 2012-21-18
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 the structural integrity of the wing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct repetitive inspections for cracks in Stringer 11 using in-tank eddy current high frequency (ETHF) inspections. Perform a splice repair if cracks are found, followed by post-repair inspections at specified intervals. Repair any cracks found during post-repair inspections.
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Compliance Time
Within 9,470 flight cycles after the effective date of this AD or before the accumulation of 14,000 total flight cycles, whichever occurs later.
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Affected Aircraft
The Boeing Company Model MD-90-30 airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin MD90-57A030, dated February 14, 2012.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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