AD 50-37-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Don Luscombe Aviation History Foundation, Inc. | 8C | Airworthiness Directives; LUSCOMBE Model 8C Airplanes |
Unsafe Condition
Engine failure may occur during takeoff and climb under low fuel conditions due to marginal rate of fuel flow from the gravity feed fuselage fuel tank.
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Required Actions
Modify the fuel system to install either an engine-driven fuel pump and a Chevrolet AC-R1 hand pump, or two 11.5-gallon wing fuel tanks with revised fuel system. Alternatively, install one 11.5-gallon wing tank feeding the engine directly and placard the instrument panel or fuel valve with specific instructions.
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Compliance Time
prior to the next annual inspection, but in no case later than October 1, 1951
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Affected Aircraft
LUSCOMBE Model 8C Airplanes with a Continental A-75 Carburetor Engine installed but not equipped with either wing fuel tanks, an engine-driven fuel pump, or a Chevrolet AC-R1 hand pump.
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Federal Register Abstract
Fuel System Modifications
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_50-37-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-37-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LUSCOMBE Model 8C Airplanes Subject: Fuel System Modifications Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Don Luscombe Aviation History Foundation, Inc. Model: 8C Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 50-37-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-37-01 SUBJECT HEADING: Airworthiness Directives; LUSCOMBE Model 8C Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-37-01 LUSCOMBE: Applies to All Model 8C Airplanes With a Continental A-75 Carburetor Engine Installed But Not Equipped With Either Wing Fuel Tanks, or an Engine- Driven Fuel Pump and the Chevrolet AC-R1 Hand Pump. To be accomplished prior to the next annual inspection, but in no case later than October 1, 1951. It has come to our attention that some Luscombe 8C airplanes equipped with carburetor engines and fuselage fuel tanks are in service without appropriate modifications to the fuel system. Because of the marginal rate of fuel flow which can exist with the gravity feed fuselage fuel tank, engine failure may occur during takeoff and climb under low fuel conditions. To eliminate this hazard, the airplane should be modified to provide either an engine-driven fuel pump and a hand operated Chevrolet AC-R1 wobble pump, or two 11.5-gallon wing fuel tanks and revised fuel system replacing the 14-gallon fuselage tank system. Another satisfactory installation is to provide one 11.5-gallon wing fuel tank. This tank must not feed through the fuselage tank but must feed the engine directly. A placard must also be placed on the instrument panel or at the fuel valve reading, "For takeoff and landing, use 11.5- gallon wing tank only". (Luscombe Service Letter, dated August 4, 1947, titled "Method of Effecting Engine Change for Increased Horsepower" pertains to this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_50-37-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-37-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LUSCOMBE Model 8C Airplanes Subject: Fuel System Modifications Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Don Luscombe Aviation History Foundation, Inc. Model: 8C 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: 50-37-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-37-01 SUBJECT HEADING: Airworthiness Directives; LUSCOMBE Model 8C Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-37-01 LUSCOMBE: Applies to All Model 8C Airplanes With a Continental A-75 Carburetor Engine Installed But Not Equipped With Either Wing Fuel Tanks, or an Engine- Driven Fuel Pump and the Chevrolet AC-R1 Hand Pump. To be accomplished prior to the next annual inspection, but in no case later than October 1, 1951. It has come to our attention that some Luscombe 8C airplanes equipped with carburetor engines and fuselage fuel tanks are in service without appropriate modifications to the fuel system. Because of the marginal rate of fuel flow which can exist with the gravity feed fuselage fuel tank, engine failure may occur during takeoff and climb under low fuel conditions. To eliminate this hazard, the airplane should be modified to provide either an engine-driven fuel pump and a hand operated Chevrolet AC-R1 wobble pump, or two 11.5-gallon wing fuel tanks and revised fuel system replacing the 14-gallon fuselage tank system. Another satisfactory installation is to provide one 11.5-gallon wing fuel tank. This tank must not feed through the fuselage tank but must feed the engine directly. A placard must also be placed on the instrument panel or at the fuel valve reading, "For takeoff and landing, use 11.5- gallon wing tank only". (Luscombe Service Letter, dated August 4, 1947, titled "Method of Effecting Engine Change for Increased Horsepower" pertains to this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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