AD 49-05-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Model 749 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Model 749 Aircraft |
Unsafe Condition
The shank section of Curtiss 850-4C2-0 propeller blades delivered before November 1, 1948, with less than 700 hours service and not previously magnafluxed may contain undetected defects.
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Required Actions
Magnetically inspect the shank section (outboard to 18-inch station) of all affected blades using a coil ≤27 inches diameter and ≥8,000 ampere turns. Prioritize inspection of blades with lowest service time.
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Compliance Time
March 25, 1949
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Affected Aircraft
Lockheed Model 749-79 and 749A-79 aircraft equipped with Curtiss 850-4C2-0 propeller blades delivered before November 1, 1948, having less than 700 hours service and not previously magnafluxed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Curtiss 850-4C2-0 Propeller Blades
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-05-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-05-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 749 Aircraft Subject: Curtiss 850-4C2-0 Propeller Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 749-79 | 749A-79 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 49-05-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-05-01 SUBJECT HEADING: LOCKHEED Model 749 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-05-01 LOCKHEED: Applies to All 749 Aircraft Equipped With Curtiss 850-4C2-0 Propeller Blades. Compliance required by March 25, 1949. Magnetically inspect the shank section, as far outboard as the 18-inch station, of all 850- 4C2-0 blades delivered before November 1, 1948, having less than 700 hours service and which have not been magnafluxed since delivery, using a coil not greater than 27 inches in diameter and providing at least 8,000 ampere turns, inspection of blades with lowest service time should be accomplished first wherever possible. (Curtiss Service Bulletin No. 47 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-05-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-05-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 749 Aircraft Subject: Curtiss 850-4C2-0 Propeller Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 749-79 | 749A-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: AIRWORTHINESS DIRECTIVES FINAL RULES: 49-05-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-05-01 SUBJECT HEADING: LOCKHEED Model 749 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-05-01 LOCKHEED: Applies to All 749 Aircraft Equipped With Curtiss 850-4C2-0 Propeller Blades. Compliance required by March 25, 1949. Magnetically inspect the shank section, as far outboard as the 18-inch station, of all 850- 4C2-0 blades delivered before November 1, 1948, having less than 700 hours service and which have not been magnafluxed since delivery, using a coil not greater than 27 inches in diameter and providing at least 8,000 ampere turns, inspection of blades with lowest service time should be accomplished first wherever possible. (Curtiss Service Bulletin No. 47 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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