AD 2004-23-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | DC-9-14 and DC-9-15 | Airworthiness Directives; McDonnell Douglas Model DC-9-14 and DC-9-15 Airplanes; and Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes |
Unsafe Condition
Reports of cracks in the upper cap of the center wing rear spar that resulted from stress corrosion.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a high frequency eddy current inspection to detect cracks in the vertical radius of the upper cap of the center wing rear spar. If no crack is found, repeat the inspection at intervals not to exceed 15,000 flight cycles or 5 years. If a crack is found, repair it before further flight using a method approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA.
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Compliance Time
Before the accumulation of 25,000 total flight cycles, or within 15,000 flight cycles or 5 years after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Certain McDonnell Douglas Model DC-9-14, DC-9-15, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-33F, DC-9-34, DC-9-34F, DC-9-32F (C-9A, C-9B), DC-9-41, and DC-9-51 airplanes, certificated in any category; as listed in Boeing Service Bulletin DC9-57-223, dated July 21, 2003.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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