AD 58-15-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft |
Unsafe Condition
Hook assemblies, part number CSS1000-D, installed in safety belt assemblies, part number 5610175, are understrength due to improper heat treatment by the vendor.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect hook assemblies using a Rockwell hardness test. Replace any hook assembly with a Rockwell reading below 36 on the 'C' scale. Follow Douglas Alert Service Bulletins A-779 (DC-6 Series) and A-321 (DC-7 Series) for inspection and replacement procedures.
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Compliance Time
by September 1, 1958
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Affected Aircraft
Douglas DC-6 and DC-7 Series aircraft equipped with safety belt assemblies P/N 5610175 and hook assemblies P/N CSS1000-D manufactured between December 1957 and February 1958.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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