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

Harold S. Firth

Named as the FAA publishes it on its approvals.

Holds 1 approved modification, most of them for the Lockheed 12. FAA spelling: Harold S. Firth.

Approved modifications 1 · newest first

Lockheed 12 1
1969-01-15SA1860WE · ONE ONLY STC, SN 1229: Installation of Goodyear Wheels and Brakes · 12-A (Army UC-40; UC-40A)

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.