AD 51-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 35 | Airworthiness Directives; Beech Models 35 and A35 Aircraft |
| aircraft | Textron Aviation Inc. | A35 | Airworthiness Directives; Beech Models 35 and A35 Aircraft |
Unsafe Condition
The unmodified Adel 20653 electric fuel pump's leaking shaft seal could allow air leakage into the fuel system.
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Required Actions
Remove the unmodified Adel 20653 electric fuel pump and associated installation components from the aircraft.
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Compliance Time
as soon as possible, but in any event, not later than April 1, 1949
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Affected Aircraft
Beech Models 35 and A35 aircraft equipped with unmodified Adel 20653 electric fuel pump installation.
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Federal Register Abstract
Fuel Booster Pump Removal
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_51-14-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 51-14-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Models 35 and A35 Aircraft Subject: Fuel Booster Pump Removal Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Textron Aviation Inc. Model: 35 | A35 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 51-14-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 51-14-01 SUBJECT HEADING: Airworthiness Directives; Beech Models 35 and A35 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 51-14-01 BEECH: Applies to All Models 35 and A35 Aircraft Equipped With Unmodified Adel 20653 Electric Fuel Pump Installation. Compliance was required as soon as possible, but in any event, not later than April 1, 1949. To prevent the possibility of air leakage into the airplane's fuel system through a leaking shaft seal of the unmodified 20653 pump, this pump and associated installation components are to be removed from the airplane. Aircraft equipped with a modified fuel booster pump installation, which consists of a modified Adel 20653 electric-driven fuel pump (identified by either a 1/8 inch red band around the pump body, or the suffix "H" in the pump serial number, in series with a modified Thompson TF-1100 engine-driven fuel pump (identified by a "2" or "M2" stamped after the TF-1100 on the nameplate)) installed in accordance with Beech Installation Instructions, revised March 31, 1949, are not affected by this Airworthiness Directive. (Beech Letter D-49-540 dated January 7, 1949, and Installation Instructions for the Model 35 Electric-Driven Auxiliary Fuel Pump, revised March 31, 1949, covers this same subject.) This supersedes AD 49-28-02. FOOTER:
Document Text
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AD Final Rules - DRS_51-14-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 51-14-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Models 35 and A35 Aircraft Subject: Fuel Booster Pump Removal Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Textron Aviation Inc. Model: 35 | A35 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: 51-14-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 51-14-01 SUBJECT HEADING: Airworthiness Directives; Beech Models 35 and A35 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 51-14-01 BEECH: Applies to All Models 35 and A35 Aircraft Equipped With Unmodified Adel 20653 Electric Fuel Pump Installation. Compliance was required as soon as possible, but in any event, not later than April 1, 1949. To prevent the possibility of air leakage into the airplane's fuel system through a leaking shaft seal of the unmodified 20653 pump, this pump and associated installation components are to be removed from the airplane. Aircraft equipped with a modified fuel booster pump installation, which consists of a modified Adel 20653 electric-driven fuel pump (identified by either a 1/8 inch red band around the pump body, or the suffix "H" in the pump serial number, in series with a modified Thompson TF-1100 engine-driven fuel pump (identified by a "2" or "M2" stamped after the TF-1100 on the nameplate)) installed in accordance with Beech Installation Instructions, revised March 31, 1949, are not affected by this Airworthiness Directive. (Beech Letter D-49-540 dated January 7, 1949, and Installation Instructions for the Model 35 Electric-Driven Auxiliary Fuel Pump, revised March 31, 1949, covers this same subject.) This supersedes AD 49-28-02. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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