AD 49-30-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | Kelowna Flightcraft R & D Ltd. | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft |
| aircraft | The Boeing Company | Kelowna Flightcraft R & D Ltd. | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft |
| aircraft | The Boeing Company | Kelowna Flightcraft R & D Ltd. | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft |
| aircraft | The Boeing Company | Kelowna Flightcraft R & D Ltd. | 240 Series | Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft |
Unsafe Condition
Cracks in the threaded portion of the hub barrels of Curtiss Model C632S-A propellers have been discovered.
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Required Actions
Preflight visual inspections must be made in accordance with Curtiss Instructions to all owners dated May 12, 1949. Magnetic inspections are recommended where equipment is available. Cracked hubs must be retired immediately. Comply with Douglas Co. telegram of May 25, 1949 operational procedures.
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Compliance Time
as soon as possible but not later than August 15, 1949
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Affected Aircraft
Douglas DC-6 (all variants: DC-6, DC-6A, DC-6B) and Convair 240 Series aircraft equipped with Curtiss Model C632S-A propellers.
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Federal Register Abstract
Hub Barrels
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-30-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-30-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft Subject: Hub Barrels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company | Kelowna Flightcraft R & D Ltd. Model: DC-6 | DC-6A | DC-6B | 240 Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 49-30-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-30-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-30-01 DOUGLAS AND CONVAIR: Applies to All DC-6 and 240 Aircraft Equipped With Curtiss Model C632S-A Propellers. Compliance required as soon as possible but not later than August 15, 1949. Because of a number of cracks having been discovered in the threaded portion of the hub barrels of the C632S-A propellers, preflight visual inspections must be made in accordance with Curtiss Instructions to all owners dated May 12, 1949. It is strongly recommended that wherever the necessary equipment is available, magnetic inspections be made in accordance with Curtiss Instructions entitled, "Field Magnetic Inspection of C632S-A Hubs". Any hubs revealing cracks must be retired from service immediately. The above inspections are to remain in effect as long as these propellers are in service regardless of any rework accomplished. Operational procedures for the Douglas DC-6 during ground run, takeoff and climb, as recommended by the Douglas Co. telegram of May 25, 1949, must also be complied with. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-30-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-30-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft Subject: Hub Barrels Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company | Kelowna Flightcraft R & D Ltd. Model: DC-6 | DC-6A | DC-6B | 240 Series 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: 49-30-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-30-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-6 AND CONVAIR 240 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-30-01 DOUGLAS AND CONVAIR: Applies to All DC-6 and 240 Aircraft Equipped With Curtiss Model C632S-A Propellers. Compliance required as soon as possible but not later than August 15, 1949. Because of a number of cracks having been discovered in the threaded portion of the hub barrels of the C632S-A propellers, preflight visual inspections must be made in accordance with Curtiss Instructions to all owners dated May 12, 1949. It is strongly recommended that wherever the necessary equipment is available, magnetic inspections be made in accordance with Curtiss Instructions entitled, "Field Magnetic Inspection of C632S-A Hubs". Any hubs revealing cracks must be retired from service immediately. The above inspections are to remain in effect as long as these propellers are in service regardless of any rework accomplished. Operational procedures for the Douglas DC-6 during ground run, takeoff and climb, as recommended by the Douglas Co. telegram of May 25, 1949, must also be complied with. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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