AD 2006-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | DC-9-10 | Airworthiness Directives; McDonnell Douglas Model DC-9-10 Series Airplanes; DC-9-20 Series Airplanes; DC-9-30 Series Airplanes; DC-9-40 Series Airplanes; and DC-9-50 Series Airplanes |
Unsafe Condition
A significant number of McDonnell Douglas Model DC-9 series airplanes are approaching or exceeding the design service goal on which the initial type certification approval was predicated, leading to potential fatigue cracking that could compromise structural integrity.
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Required Actions
Replace the FAA-approved maintenance inspection program with a revised program that provides for inspections of the principal structural elements (PSEs) as defined in McDonnell Douglas Report No. L26-008, Section 2 of Volume I, Revision 4, dated July 1993. Inspect each PSE sample using non-destructive inspection (NDI) procedures set forth in Section 2 of Volume II, Revision 4, dated July 1993, and report all inspection results to Boeing.
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Compliance Time
Within 6 months after July 24, 1996 (the effective date of AD 96-13-03)
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Affected Aircraft
All McDonnell Douglas Model DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, and DC-9-15F airplanes; DC-9-21 airplanes; DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-33F, DC-9-34, DC-9-34F, and DC-9-32F (C-9A, C-9B) airplanes; DC-9-41 airplanes; and DC-9-51 airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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