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

Sinclair Oil & Gas CO

Named as the FAA publishes it on its approvals.

Holds 2 approved modifications, most of them for the Piper PA-23 Apache and Aztec. FAA spelling: Sinclair Oil & Gas Co.

Approved modifications 2 · newest first

Piper PA-23 Apache and Aztec 1Beechcraft 65 1
1966-09-23SA695SW · Remove engine induction system air filter · 65-A80
1964-01-08SA311SW · Alternate static source. · PA-23

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.