AD 47-51-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46A | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46D | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46F | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46R | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46E | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | C-46/CW20-T | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
| aircraft | Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation | Super C-46/CW20-T | Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes |
Unsafe Condition
Failure of the propeller flexible feathering line due to disintegration and deterioration of the flexible propeller feathering hose and lagging material.
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Required Actions
Inspect the flexible propeller feathering hose and lagging material for disintegration and deterioration, replace the hose if deteriorated, install an antiheat shield with fabricated clamps as per Figure 1, and check propeller feathering system operation after installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
March 1, 1948
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Affected Aircraft
CURTISS-WRIGHT Model C-46 Series Airplanes incorporating Hamilton Standard Propellers, including models C-46A, C-46D, C-46F, C-46R, C-46E, C-46/CW20-T, and Super C-46/CW20-T.
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Federal Register Abstract
Propeller Antiheat Shield
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-51-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-51-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes Subject: Propeller Antiheat Shield Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Air...Show more Model: C-46A | C-46D | C-46F | C-46R | C-46E | C-46/CW20-T | Super C-46/CW20-T 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: 47-51-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-51-04 SUBJECT HEADING: Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-51-04 CURTISS-WRIGHT Applies to All C-46 Series Airplanes Incorporating Hamilton Standard Propellers. Compliance required by March 1, 1948. To eliminate failure of the propeller flexible feathering line, an antiheat shield shall be installed in accordance with the following instructions: (a) Remove the engine cowling adjacent to the propeller feathering line and inspect the flexible propeller feathering hose and lagging material (if installed) for disintegration and deterioration. Replace hose if deterioration is evident. (b) Fabricate the antiheat shield and attaching clamps as shown in Figure 1. (c) Place antiheat shield over the flexible hose and mount the shield on the engine mount by use of the clamps shown in Figure 1. The shield should be centered over the flexible hose. It may be necessary to rebend the metal feathering line slightly to achieve proper centering. (d) Upon completion of installation, check operation of propeller feathering system. (The above information is also contained in Army Air Forces Technical Order 01-25L- 105 dated April 2, 1947. Copies of this Technical Order are not available for distribution by the FAA.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-51-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-51-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes Subject: Propeller Antiheat Shield Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Air...Show more Model: C-46A | C-46D | C-46F | C-46R | C-46E | C-46/CW20-T | Super C-46/CW20-T 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: 47-51-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-51-04 SUBJECT HEADING: Airworthiness Directives; CURTISS-WRIGHT Model C-46 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-51-04 CURTISS-WRIGHT Applies to All C-46 Series Airplanes Incorporating Hamilton Standard Propellers. Compliance required by March 1, 1948. To eliminate failure of the propeller flexible feathering line, an antiheat shield shall be installed in accordance with the following instructions: (a) Remove the engine cowling adjacent to the propeller feathering line and inspect the flexible propeller feathering hose and lagging material (if installed) for disintegration and deterioration. Replace hose if deterioration is evident. (b) Fabricate the antiheat shield and attaching clamps as shown in Figure 1. (c) Place antiheat shield over the flexible hose and mount the shield on the engine mount by use of the clamps shown in Figure 1. The shield should be centered over the flexible hose. It may be necessary to rebend the metal feathering line slightly to achieve proper centering. (d) Upon completion of installation, check operation of propeller feathering system. (The above information is also contained in Army Air Forces Technical Order 01-25L- 105 dated April 2, 1947. Copies of this Technical Order are not available for distribution by the FAA.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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