49-48-01: Thompson Fuel Pump
FAA order 49-48-01 is an airworthiness directive. The FAA's subject line: Thompson Fuel Pump. System: fuel system.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Textron Aviation Inc.
- Models
- 35, A35
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 (737 characters)
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.)
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/49-48-01.json · aircraft systems.