AD 98-04-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDonnell Douglas and Model DC-9-10, -20, -30, -40, -50 Series Airplanes , and Model DC-9-81 (MD-81) and DC-9-82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes |
Unsafe Condition
Fatigue cracking and improperly seated attachments in the upper fuselage skin in the area of the aft pressure bulkhead tee between longerons 14 left and 14 right, which could result in rapid decompression of the fuselage and consequent reduced structural integrity of the airplane.
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Required Actions
Conduct an initial visual inspection to determine if an internal production titanium doubler has been installed. Perform repetitive high frequency eddy current (HFEC) inspections to detect cracks in the upper skin splice area. Install an interim repair or replace failed fasteners with new fasteners if necessary. Optional terminating permanent repair is available to eliminate repetitive inspections.
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Compliance Time
Effective February 25, 1998.
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Affected Aircraft
McDonnell Douglas Model DC-9-10, -20, -30, -40, -50, -81 (MD-81), -82 (MD-82) Series Airplanes, and C-9 (Military) Series Airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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