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

Underwood - Instrument Services, INC.

Named as the FAA publishes it on its approvals.

Holds 1 approved modification, most of them for the Learjet 25. FAA spelling: Underwood - Instrument Services, Inc..

Approved modifications 1 · newest first

Learjet 25 1Learjet 24 1
2002-06-11ST09992SC · Replace existing production installed S-225 series Mach Airspeed Indicators with REVUE THOMMEN AG Type... · 24, 24A, 24B

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.