AD 52-28-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All Model DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All Model DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All Model DC-6 Series Aircraft |
Unsafe Condition
Cracks in the lower wing skin and doubler at the center wing lower surface access hole structure at Station 149, which could lead to structural failure if not detected and repaired.
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Required Actions
Inspect for cracks in the lower wing skin and doubler using an 8-power magnifying glass or dye check method. Stop drill cracks less than 1-inch long, and perform permanent rework per Douglas Drawing No. 5400661 for longer cracks or those under adjacent angles. Replace interim repairs within specified intervals.
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Compliance Time
As soon as practical but not later than the next 50 hours operation, with subsequent inspections at 500-hour intervals until permanent repair is made. Periodic inspections must continue at intervals between 15 and 35 flying hours until permanent rework is completed.
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Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft with Fuselage Numbers 1 to 213 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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