AD 83-15-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32F | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -30, -40, and C-9 Series Airplanes |
Unsafe Condition
Cracks in the ventral aft pressure bulkhead web along AD4 rivet rows and firex support stiffeners due to insulation material contact.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Roll back or remove and retain insulation material, clean and perform close detail visual checks for cracks in specified areas, rework cracked bulkhead panels using specified service sketches, and obtain special flight permits if needed. Alternate compliance may be approved.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 additional cycles after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas Model DC-9-10, -30, -40, and Military C-9 series airplanes, fuselage numbers 20 through 264, with ventral aft pressure bulkhead not in compliance with Service Bulletin A53-144.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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