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

William C. Warren

Named as the FAA publishes it on its approvals.

Holds 2 approved modifications, most of them for the Boeing D75. FAA spelling: William C. Warren.

Approved modifications 2 · newest first

Boeing D75 1
1984-06-27SA2616NM · Installation of Aerodynamic Aileron Assists (Spades) on the Upper Airleron. · D75N1 (Army PT-27)
1982-07-02SA1669NM · Installation of a PRatt and Whitney R-985-14B engine; a Hamilton Standard 2D30/6101-12 propeller; upper and lower... · Boeing Airplane Company, Wichita DivisionA75N1...

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