AD 55-26-02
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Thompson Products, Inc. | Fuel Pumps | Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps |
| appliance | Thompson Products, Inc. | Fuel Pumps | Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps |
Unsafe Condition
TF-1100 fuel pump failure resulting from excessive drive pin wear
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove pump from certificated airplanes and replace with Thompson TF-1900 pump having larger diameter drive pin not later than August 1, 1956. Until then, replace the drive pin (Thompson Part No. TF-1191) at each 100-hour aircraft inspection and inspect the rotor for excessive elongation, replacing it if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than August 1, 1956
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Thompson TF-1100-2 and TF-1100-M2 Pumps
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Pumps
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_55-26-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-26-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and ...Show more Subject: Fuel Pumps Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Thompson Products, Inc. Model: Fuel Pumps Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 55-26-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-26-02 SUBJECT HEADING: Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-26-02 THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps. Compliance required as indicated. To prevent TF-1100 fuel pump failure resulting from excessive drive pin wear, accomplish the following: 1. Remove pump from certificated airplanes and replace with Thompson TF-1900 pump having larger diameter drive pin not later than August 1, 1956. TF-1100 pumps may be converted to TF-1900 pumps when modified in accordance with Thompson Service Bulletin ESD-182A and Amendment ESD-182B. 2. Until installation of the TF-1900 pump, the drive pin (Thompson Part No. TF-1191) in the TF-1100 pumps should be replaced with an unused pin at the next 100-hour aircraft inspection and each 100 hours thereafter. At the time of pin replacement, inspect the drilled hole in the TF-1100 rotor for excessive elongation and, if necessary, replace rotor. (Thompson Products Service Bulletin ESD-176A covers this same subject.) This supersedes AD 55-19-02. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_55-26-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-26-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and ...Show more Subject: Fuel Pumps Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Thompson Products, Inc. Model: Fuel Pumps Product Type: Appliance 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: 55-26-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-26-02 SUBJECT HEADING: Airworthiness Directives; THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-26-02 THOMPSON ENGINE DRIVE FUEL PUMPS: Applies to All Thompson TF-1100-2 and TF-1100-M2 Pumps. Compliance required as indicated. To prevent TF-1100 fuel pump failure resulting from excessive drive pin wear, accomplish the following: 1. Remove pump from certificated airplanes and replace with Thompson TF-1900 pump having larger diameter drive pin not later than August 1, 1956. TF-1100 pumps may be converted to TF-1900 pumps when modified in accordance with Thompson Service Bulletin ESD-182A and Amendment ESD-182B. 2. Until installation of the TF-1900 pump, the drive pin (Thompson Part No. TF-1191) in the TF-1100 pumps should be replaced with an unused pin at the next 100-hour aircraft inspection and each 100 hours thereafter. At the time of pin replacement, inspect the drilled hole in the TF-1100 rotor for excessive elongation and, if necessary, replace rotor. (Thompson Products Service Bulletin ESD-176A covers this same subject.) This supersedes AD 55-19-02. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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