AD 50-47-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Superior Aircraft Company | V | Airworthiness Directives; Culver Models V and V2 Aircraft |
| aircraft | Superior Aircraft Company | V-2 | Airworthiness Directives; Culver Models V and V2 Aircraft |
Unsafe Condition
Broken blade lag screws and cracked blade shanks and ferrules due to excessive vibratory stresses from operation beyond allowable engine rpm ratings.
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Required Actions
Replace C276A2 blades with PC276A6, PC276A7, or C276A6 models by January 31, 1951. Inspect blades every 500 hours of operation for cracks in wood shank and split retaining ring groove, check-tighten lag screws to 160 inch-pounds torque, and magnetically inspect ferrule and hub ferrous parts. Ensure tachometer accuracy to avoid operation beyond 1,800-2,000 rpm with extended nose landing gear.
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Compliance Time
prior to January 31, 1951
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Affected Aircraft
Culver Models V and V2 aircraft equipped with Sensenich Models C2FB3 or C2FB1 propellers with C276A2, PC276A6, PC276A7, or C276A6 blades.
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Federal Register Abstract
Sensenich Propeller Blades
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_50-47-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-47-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Culver Models V and V2 Aircraft Subject: Sensenich Propeller Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Superior Aircraft Company Model: V | V-2 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 50-47-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-47-02 SUBJECT HEADING: Airworthiness Directives; Culver Models V and V2 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-47-02 CULVER: Applies to All Models V and V2 Aircraft Equipped With Sensenich Models C2FB3 or C2FB1 Propeller With C276A2, PC276A6, PC276A7 and C276A6 Blades. Compliance required as indicated. (1) Replacement required prior to January 31, 1951. In order to eliminate the continued occurrence of broken blade lag screws and/or cracked blade shanks and ferrules, all C276A2 blades must be retired from service and replaced with blade Model PC276A6, PC276A7 or C276A6. (2) Inspection required every 500 hours of operation after installation of blade Models PC276A6, PC276A7 and C276A6. The propeller blades should be removed from the hub, and the wood blade shank and the split retaining ring groove in the blade ferrule should be carefully inspected for cracks. The lag screws should be check-tightened to 160 inch-pounds torque. Blade with broken lag screws or cracked wood shank or ferrule must be removed from service. The ferrule and all ferrous metallic parts of the hub should be magnetically inspected. The blades are subjected to excessive vibratory stresses when operation beyond the allowable engine r.p.m. ratings inadvertently occurs. It is recommended, therefore, that the accuracy of the tachometer be checked in order to preclude such operation. Operation between 1,800-2,000 r.p.m. is to be avoided when the nose landing gear is extended. (Sensenich Service Bulletins Nos. 133, 134 and 135 cover these same subjects.) This supersedes AD 47-47-09. FOOTER:
Document Text
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AD Final Rules - DRS_50-47-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-47-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Culver Models V and V2 Aircraft Subject: Sensenich Propeller Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Superior Aircraft Company Model: V | V-2 Product Type: Aircraft Product Subtype: Small 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: 50-47-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-47-02 SUBJECT HEADING: Airworthiness Directives; Culver Models V and V2 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-47-02 CULVER: Applies to All Models V and V2 Aircraft Equipped With Sensenich Models C2FB3 or C2FB1 Propeller With C276A2, PC276A6, PC276A7 and C276A6 Blades. Compliance required as indicated. (1) Replacement required prior to January 31, 1951. In order to eliminate the continued occurrence of broken blade lag screws and/or cracked blade shanks and ferrules, all C276A2 blades must be retired from service and replaced with blade Model PC276A6, PC276A7 or C276A6. (2) Inspection required every 500 hours of operation after installation of blade Models PC276A6, PC276A7 and C276A6. The propeller blades should be removed from the hub, and the wood blade shank and the split retaining ring groove in the blade ferrule should be carefully inspected for cracks. The lag screws should be check-tightened to 160 inch-pounds torque. Blade with broken lag screws or cracked wood shank or ferrule must be removed from service. The ferrule and all ferrous metallic parts of the hub should be magnetically inspected. The blades are subjected to excessive vibratory stresses when operation beyond the allowable engine r.p.m. ratings inadvertently occurs. It is recommended, therefore, that the accuracy of the tachometer be checked in order to preclude such operation. Operation between 1,800-2,000 r.p.m. is to be avoided when the nose landing gear is extended. (Sensenich Service Bulletins Nos. 133, 134 and 135 cover these same subjects.) This supersedes AD 47-47-09. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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