AD 49-48-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 35 | Airworthiness Directives; Beech Model 35 and A35 Airplanes |
| aircraft | Textron Aviation Inc. | A35 | Airworthiness Directives; Beech Model 35 and A35 Airplanes |
Unsafe Condition
Complete or partial loss of carburetor fuel inlet pressure resulting from misalignment of pump relief valve spring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace Thompson TF-1100, TF-1100-1, or TF-1100M engine-driven fuel pumps with improved Thompson pump TF-1100-M2, TF-1100-2, or another eligible pump listed on Aircraft Specification A-777. Existing pumps may be converted by the pump manufacturer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than February 1, 1950
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Beech Model 35 and A35 airplanes equipped with Thompson TF-1100, TF-1100-1, or TF-1100M engine-driven fuel pumps.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Thompson Fuel Pump
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-48-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-48-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Model 35 and A35 Airplanes Subject: Thompson Fuel Pump 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Date: Make: Textron Aviation Inc. Model: 35 | A35 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 49-48-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-48-01 SUBJECT HEADING: Airworthiness Directives; Beech Model 35 and A35 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-48-01 BEECH: Applies to All Models 35 and A35 Airplanes Equipped With Thompson TF-1100, TF-1100-1 or TF-1100M Engine Driven Fuel Pumps. Compliance required not later than February 1, 1950. To prevent complete or partial loss of carburetor fuel inlet pressure resulting from misalignment of pump relief, valve spring, replace Thompson TF-1100, TF-1100-1 or TF-1100M engine driven fuel pump with improved Thompson pump, TF-1100-M2 or TF-1100-2, or another eligible pump listed on Aircraft Specification A-777. Thompson TF-1100, TF-1100-1 and TF- 1100M pumps may be converted to TF-1100-M2 or TF-1100-2 pumps by the pump manufacturer. (Beech Distributor Letter No. D-49-615 dated September 23, 1949, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-48-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-48-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Model 35 and A35 Airplanes Subject: Thompson Fuel Pump 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: 49-48-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-48-01 SUBJECT HEADING: Airworthiness Directives; Beech Model 35 and A35 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-48-01 BEECH: Applies to All Models 35 and A35 Airplanes Equipped With Thompson TF-1100, TF-1100-1 or TF-1100M Engine Driven Fuel Pumps. Compliance required not later than February 1, 1950. To prevent complete or partial loss of carburetor fuel inlet pressure resulting from misalignment of pump relief, valve spring, replace Thompson TF-1100, TF-1100-1 or TF-1100M engine driven fuel pump with improved Thompson pump, TF-1100-M2 or TF-1100-2, or another eligible pump listed on Aircraft Specification A-777. Thompson TF-1100, TF-1100-1 and TF- 1100M pumps may be converted to TF-1100-M2 or TF-1100-2 pumps by the pump manufacturer. (Beech Distributor Letter No. D-49-615 dated September 23, 1949, covers this same subject.) 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.
Related Airworthiness Directives
2025-07-01
final ruleAirworthiness Directives; Thommen Aircraft Equipment AG Digital Air Data Computers
Unsafe Condition: Occurrences of AC32 Digital ADCs that stopped functioning due to the power module failing at temperatures below -20 degrees Celsius.
2024-14-03
final ruleAirworthiness Directives; Various Airplanes
Unsafe Condition: an un-commanded automatic pitch trim runaway when the autopilot was first engaged, which could result in un-commanded automatic pitch trim runaway and loss of control of the airplane.
2023-09-09 Recurring
final ruleAirworthiness Directives; Various Airplanes, Helicopters, and Engines
Unsafe Condition: Multiple failures of spot-welded, multi-segment v-band couplings at the tailpipe to the turbocharger exhaust housing flange.
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...