AD 2007-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | Various | Airworthiness Directives; 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 |
Unsafe Condition
Cracks in the horizontal stabilizer's upper and lower aft skin panels at the aft inboard corner at station XH = 8.2, and in the rear spar upper caps adjacent to the aft skin panel at station XH = 10.0, which, if not corrected, could lead to the loss of overall structural integrity of the horizontal stabilizer.
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Required Actions
Conduct repetitive inspections using low- and high-frequency eddy current methods to detect cracks in the specified areas. Take corrective actions based on crack length, location, and repairability, including stop drilling, trimming and installing a filler, installing a skin panel or rear spar upper cap splice, replacing parts, or repeating inspections. For cracks meeting Condition 2 criteria, install a horizontal stabilizer aft skin panel splice or replace the skin panel within 4,000 flight cycles after detection.
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Compliance Time
Within 4,000 flight cycles after crack detection for specific corrective actions; repetitive inspections as per service bulletin intervals.
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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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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