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Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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On this page
The airworthiness directive
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.
Registered aircraft
NTSB investigations that cite this AD · 1
Their narratives or probable cause name AD 55-26-02, often to say whether the aircraft complied with it.