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.)