55-26-02: Fuel Pumps
FAA order 55-26-02 is an airworthiness directive. The FAA's subject line: Fuel Pumps. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Appliance
- Makes
- Thompson Products, Inc.
- Models
- Fuel Pumps
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (997 characters)
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 supersedesAD 55-19-02.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/55-26-02.json · aircraft systems.