The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Nelson Filter

Holds 3 approved modifications, most of them for the American Champion Aircraft 7 Citabria and Champ. FAA spelling: Nelson Filter.

Approved modifications 3 · newest first

American Champion Aircraft 7 Citabria and Champ 1Beechcraft 35 Bonanza and Debonair 1Beechcraft 65 1Beechcraft 95 Travel Air and Baron 55 1Bell 47 1Bellanca 14 1Bellanca 7 Citabria 1Cessna 150 1Cessna 170 1Cessna 172 Skyhawk 1Cessna 175 Skylark 1Cessna 180 Skywagon 1
1974-08-29SA630WE · Installation of oil filter assemblies. (NAVION A AND B with optional engine) · A-9A, H-250, H-295 (USAF U-10D)
1974-08-29SA1744WE · Installation of oil filter assemblies. · C-46 Series, Army B-23, Army A-26B
1974-08-29SA584WE · Installation of oil filter assemblies. · 47J-2A, 47J, 47K

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.