AD 61-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Aircraft |
Unsafe Condition
Cracking occurs in spar cap tangs in the area of Station 60 attachments and progresses chordwise. Temporary repairs per Douglas Rework Drawing 5611387 do not meet anticipated service life.
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Required Actions
Inspect upper and lower front and center spar caps in the area of wing Station 60, especially tangs between Stations 55 and 65. Reinspections required at intervals not exceeding specified flight hours based on model and fuselage numbers. Permanent rework or temporary repairs must be done before further flight if cracks are found, with temporary repairs limited by crack extent and requiring reinspection every 750 hours. Permanent rework must be completed within 4,200 hours after temporary repair.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft, Fuselage Numbers 1 through 722 with over 9,000 hours' time in service.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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