AD 58-15-01
final rule
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
by September 1, 1958
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Safety Belt Hook Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_58-15-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-15-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft Subject: Safety Belt Hook Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC-6 | DC-6A | DC-6B | DC-7 | DC-7B | DC-7C Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 58-15-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-15-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-15-01 DOUGLAS: Applies to DC-6 and DC-7 Series Aircraft. Compliance required by September 1, 1958. Hook assemblies, P/N CSS1000-D, installed in safety belt assemblies, P/N 5610175, have been found to be understrength due to improper heat treat by the vendor. All DC-6 and DC-7 Series aircraft equipped with these safety belt assemblies that were manufactured during the months of December 1957, January 1958, and February 1958, are affected. These belts can be identified by the manufacturing date (month and year) stamped on the part number tag sewn on the belt (i.e., date manufactured, December 1957, etc.). Belt assemblies manufactured prior to these dates are satisfactory and all future DC-6 and DC-7 aircraft will have safety belts with proper hook assemblies installed. All hook assemblies that give a Rockwell reading of 36 or above on the "C" scale are satisfactory. Those that show a Rockwell reading below 36 are unsatisfactory and the belt must be replaced. (Douglas Alert Service Bulletin A-779 for the DC-6 Series and A-321 for the DC-7 Series cover the above subject and describe acceptable inspection and replacement procedures.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_58-15-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-15-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft Subject: Safety Belt Hook Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC-6 | DC-6A | DC-6B | DC-7 | DC-7B | DC-7C Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 58-15-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-15-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS DC-6 and DC-7 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-15-01 DOUGLAS: Applies to DC-6 and DC-7 Series Aircraft. Compliance required by September 1, 1958. Hook assemblies, P/N CSS1000-D, installed in safety belt assemblies, P/N 5610175, have been found to be understrength due to improper heat treat by the vendor. All DC-6 and DC-7 Series aircraft equipped with these safety belt assemblies that were manufactured during the months of December 1957, January 1958, and February 1958, are affected. These belts can be identified by the manufacturing date (month and year) stamped on the part number tag sewn on the belt (i.e., date manufactured, December 1957, etc.). Belt assemblies manufactured prior to these dates are satisfactory and all future DC-6 and DC-7 aircraft will have safety belts with proper hook assemblies installed. All hook assemblies that give a Rockwell reading of 36 or above on the "C" scale are satisfactory. Those that show a Rockwell reading below 36 are unsatisfactory and the belt must be replaced. (Douglas Alert Service Bulletin A-779 for the DC-6 Series and A-321 for the DC-7 Series cover the above subject and describe acceptable inspection and replacement procedures.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.