AD 2023-02-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
| aircraft | McDonnell Douglas | Various | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracks in the upper and lower aft skin panels and rear spar upper caps of the horizontal stabilizer, which, if not corrected, could lead to the loss of overall structural integrity of the horizontal stabilizer.
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Required Actions
Inspect the horizontal stabilizer for cracks, and perform corrective actions as specified in Boeing Alert Service Bulletin MD80-55A065, Revision 2, dated October 11, 2021, which include options for (1) stop drilling the end of the crack or trimming out the crack, and then doing a skin splice repair or replacing the skin at the given compliance time, (2) installing a skin panel splice, or (3) replacing the skin panel, and for the rear spar upper cap, options for (1) enlarging the hole to remove the crack, (2) performing a cap splice repair, (3) performing a cap splice repair and cold-working certain holes, (4) performing a cap replacement, or (5) performing a cap replacement and cold-working certain holes.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
McDonnell Douglas 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.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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