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“This merger creates a powerful combination of a 59-yr old proven and prolific manufacturer with a robust and efficient repair station.  Try us.  You’ll be glad you did!”

Efrain Lopez, Owner

Welcome to Georgetown Instrument Services

airplane instrument repairGIS is no longer an FAA certificated repair station.  Please contact Castleberry Instruments & Avionics for your instrument and avionics needs! You can find them at


Competitive prices, high-quality workmanship, quick turnaround time and service. GIS personnel have the ability to meet that challenge to exceed customers’ expectations every day. That’s why customers depend upon GIS full services, from testing, overhaul, and repairs to exchanges and outright sales. Try us, you’ll be glad you did!