AD 2011-01-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model MD-90-30 | Airworthiness Directives; The Boeing Company Model MD-90-30 Airplanes |
Unsafe Condition
Reports of cracks found on either the left or right (or in one case, both) sides of the center section ribs of the horizontal stabilizer. Cracking in the hinge bearing lugs of the center section of the left and right ribs could result in failure of the hinge bearing lugs and consequent inability of the horizontal stabilizer to sustain the required loads.
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Required Actions
Perform high frequency eddy current (HFEC) inspections for cracking on the hinge bearing lugs of the left and right sides of the center section ribs of the horizontal stabilizer, and all applicable related investigative actions, in accordance with Boeing Alert Service Bulletin MD90-55A016, Revision 1. If cracks are found, take corrective actions including blending out small cracks or replacing the horizontal stabilizer center section rib as specified.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model MD-90-30 airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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