AD 48-27-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 649 and 749 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 649 and 749 Series Airplanes |
Unsafe Condition
Propeller hub threaded portions may not withstand excessive stresses due to insufficient shotpeening, leading to potential failure under certain operating conditions.
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Required Actions
Propeller hubs must be returned to Curtiss-Wright Corp. for shotpeening of the threaded portion. Hubs not peened before specific operating hours must be temporarily withdrawn or permanently removed from service. All hubs must be peened by February 1, 1949.
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Compliance Time
Compliance required by August 1, 1948, and February 1, 1949.
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Affected Aircraft
Lockheed Models 649 and 749 Series Airplanes equipped with Curtiss C632S-A/850-4C2-0 propellers.
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Federal Register Abstract
Propeller Hub Peening
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-27-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-27-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 649 and 749 Series Airplanes Subject: Propeller Hub Peening Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 649-79 | 749-79 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 48-27-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-27-03 SUBJECT HEADING: LOCKHEED Models 649 and 749 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-27-03 LOCKHEED: Applies to 649 and 749 Series Airplanes Equipped With Curtiss C632S-A/850-4C2-0 Propellers. Compliance required by August 1, 1948, and February 1, 1949. To increase the ability of the propeller hubs to withstand excessive stresses under certain operating conditions the hubs must be returned to Curtiss-Wright Corp., Propeller Division for shotpeening of the threaded portion of the hub barrels. Effective August 1, 1948, hubs not peened before accumulating 2,500 hours of operating time are to be permanently removed from Constellation operation. Hubs not peened before accumulating 2,000 hours of operating time are to be temporarily withdrawn from operation until shotpeened. Peening must be accomplished on all hubs by February 1, 1949, regardless of accumulated operating time. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_48-27-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-27-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 649 and 749 Series Airplanes Subject: Propeller Hub Peening Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 649-79 | 749-79 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 48-27-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-27-03 SUBJECT HEADING: LOCKHEED Models 649 and 749 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-27-03 LOCKHEED: Applies to 649 and 749 Series Airplanes Equipped With Curtiss C632S-A/850-4C2-0 Propellers. Compliance required by August 1, 1948, and February 1, 1949. To increase the ability of the propeller hubs to withstand excessive stresses under certain operating conditions the hubs must be returned to Curtiss-Wright Corp., Propeller Division for shotpeening of the threaded portion of the hub barrels. Effective August 1, 1948, hubs not peened before accumulating 2,500 hours of operating time are to be permanently removed from Constellation operation. Hubs not peened before accumulating 2,000 hours of operating time are to be temporarily withdrawn from operation until shotpeened. Peening must be accomplished on all hubs by February 1, 1949, regardless of accumulated operating time. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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