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

Columbia Helicopters

Holds 2 approved modifications, most of them for the Boeing-Vertol 107. FAA spelling: Columbia Helicopters.

Approved modifications 2 · newest first

Boeing-Vertol 107 2
1977-03-14SH422NW · Installation of electrical sensors on each main rotor blade to monitor blade integrity in flight. · 107-II
1975-08-15SH205NW · Installation improved aft transmission lower case, modification of aft transmission upper case. · 107-II

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.