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

Clark John J

Named as the FAA publishes it on its approvals.

Holds 2 approved modifications, most of them for the Douglas DC-3. FAA spelling: Clark John J.

Approved modifications 2 · newest first

Douglas DC-3 1
1960-01-01SA3-436 · AiResearch cowling vent doors. · DC-3 Series
1960-01-01SA3-441 · Main landing gear. · Army AT-11

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.