AD 61-23-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A, and DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A, and DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A, and DC-6B Aircraft |
Unsafe Condition
Cracks in the center wing front spar lower outboard cap, approximately 3 inches in length, located on the aft side of the spar cap body just outboard of the landing gear fitting (Station 163 approximately), and progressing forward into adjacent bolt holes.
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Required Actions
Conduct a dye penetrant inspection or equivalent for cracks in the aft tang of the outboard front spar lower cap for a spanwise distance of 5 inches from the inboard end (Station 163 approximately). Rework per Douglas Service Bulletin No. 802 if no cracks detected; repair or replace the spar cap depending on crack extent, incorporating specified rework if replaced. Compliance must be within 3,000 hours' time in service unless already reworked, repaired, or replaced.
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Compliance Time
Within the next 3,000 hours' time in service
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Affected Aircraft
Douglas DC-6, DC-6A, and DC-6B aircraft with serial numbers 42854 up to and including 44429.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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