AD 56-13-01
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 of wing skin and stringer 22 aft of the main landing gear fittings at the center spar, Stations 122 and 175, on DC-6 aircraft with over 10,000 hours total flight time.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect wing skin and stringer 22 for cracks at Stations 122 and 175, using visual or alternate methods like X-ray. Repair cracks per specified Service Rework Drawings based on crack length; replace skin or stringer if cracks exceed thresholds. Reinspect at periodic intervals nearest 2,500 hours until preventive repairs are installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
as soon as practicable but not later than next periodic inspection nearest 300 hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft with total flight time exceeding 10,000 hours
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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