AD 48-21-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Wytwornia Sprzetu Komunikacyjnego | 6A4-150-B3 | Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. |
| engine | Wytwornia Sprzetu Komunikacyjnego | 6A4-150-B31 | Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. |
Unsafe Condition
Binding of accelerator pump linkage in Marvel-Schebler MA-3-SPA carburetor due to worn parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check for worn accelerator pump linkage in the carburetor. Replace worn parts using Marvel-Schebler kit Part A666-581.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
after each 25 hours of operation
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Affected Aircraft
Bellanca aircraft equipped with Franklin Model 6A4-150-B3 and B31 engines.
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Federal Register Abstract
Accelerator Pump Linkage
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-21-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-21-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B...Show more Subject: Accelerator Pump Linkage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Wytwornia Sprzetu Komunikacyjnego Model: 6A4-150-B3 | 6A4-150-B31 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 48-21-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-21-01 SUBJECT HEADING: Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-21-01 BELLANCA: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. Compliance required after each 25 hours of operation. To prevent possible binding of accelerator pump linkage in Marvel-Schebler MA-3-SPA carburetor, check for worn accelerator pump linkage. Worn parts should be replaced. Marvel- Schebler have a kit (Part A666-581) available for this purpose. (Franklin Service Bulletin No. 61 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_48-21-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-21-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B...Show more Subject: Accelerator Pump Linkage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Wytwornia Sprzetu Komunikacyjnego Model: 6A4-150-B3 | 6A4-150-B31 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 48-21-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-21-01 SUBJECT HEADING: Airworthiness Directives; Bellanca: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-21-01 BELLANCA: Applies to All Aircraft Equipped With Franklin Model 6A4-150- B3 and B31 Engines. Compliance required after each 25 hours of operation. To prevent possible binding of accelerator pump linkage in Marvel-Schebler MA-3-SPA carburetor, check for worn accelerator pump linkage. Worn parts should be replaced. Marvel- Schebler have a kit (Part A666-581) available for this purpose. (Franklin Service Bulletin No. 61 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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