AD 94-01-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS Model DC-9 and C-9 (Military) Series Airplanes |
Unsafe Condition
Cracking in the ventral aft pressure bulkhead web and doublers between stations Z=34.000 and Z=74.000, caused by fatigue, could lead to bulkhead failure and rapid decompression.
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Required Actions
Conduct initial visual, low frequency eddy current, and high frequency eddy current inspections per Service Bulletin A53-264. Repeat inspections at intervals not exceeding 1,500 landings if no cracks found. Repair any detected cracks prior to further flight using FAA-approved methods. Submit initial inspection findings report within 10 calendar days.
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Compliance Time
Upon the accumulation of 50,000 or 60,000 total landings (depending on Group I or II status) or within 30/60 days after the AD's effective date (January 28, 1994), whichever occurs later.
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Affected Aircraft
McDonnell Douglas Model DC-9 and C-9 (Military) series airplanes equipped with a ventral aft pressure bulkhead web of 2014-T6 material 0.042 inch thick, as listed in Service Bulletin A53-264.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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