AD 85-01-02 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDONNELL DOUGLAS DC-9 and C-9 (Military) Series Airplanes |
Unsafe Condition
Fatigue cracks in the fuselage cabin aft ventral pressure bulkhead (P/N 5910130) and its doublers, specifically in the doorjamb upper left and right corners, could lead to structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct visual and x-ray inspections per Service Sketch 2934C of SB 53-137, R3. If cracks are found, perform modifications or replacements as specified in SB 53-137, R3 paragraphs 2.C through 2.W. Install preventive modifications or continue repetitive inspections at specified intervals. Accomplish specific service bulletins within 18 months or prior to specified cycles/landings. Operators may request adjusted intervals with substantiating data.
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Compliance Time
Within the next 700 additional landings or at the next inspection scheduled per AD 80-10-03 after the effective date (March 31, 1986).
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Affected Aircraft
McDonnell Douglas DC-9 and C-9 (Military) series airplanes, Fuselage Numbers 1 through 1087, models DC-9-11 through DC-9-85, and C-9 military variants.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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