Overview
Thom Duncan Avionics lists its shop at Winchester Municipal Airport (KBGF) in Winchester, Tennessee, and says it serves Tennessee and surrounding states. The operator publishes three main work areas: avionics installation and panel upgrades, diagnostics and corrective repair, and IFR system certification and testing.
The shop's website describes it as an FAA repair station. That is a provider-reported credential claim in this profile. No current certificate, ratings, or operations specifications are reproduced here, and this directory does not independently determine which tasks fall within an approval.
Published services
The operator describes installation of new and selected used avionics, cockpit layout planning, troubleshooting, configuration correction, and repairs. It says installations and repairs are tested and documented. The site also identifies transponder, altimeter, and IFR system certification as work it performs, with associated testing and logbook documentation.
The page discusses installation planning around the aircraft, the equipment already installed, and the owner's intended use. It says scheduling depends on project scope and the shop's production schedule. These are descriptions from the provider, not a promise of a particular result or a statement that the shop accepts every aircraft or system.
The shop's published contact page asks customers to include the aircraft make and model and avionics configuration when discussing transponder or altimeter certification. That is useful information to have ready when asking whether the shop can support a particular test. Confirm the relevant requirements and scope with the shop before arranging an aircraft transfer.
Credentials and source limits
The FAA repair-station description on the operator's website is not equivalent to an FAA record reviewed for this page. Repair-station approvals apply to defined functions and ratings. A general description of avionics work does not establish a facility's authority for each system or task.
Ask for the current repair-station certificate details and confirm the relevant rating or function for the planned work. The FAA's facility dashboard is a starting point for facility records. The FAA's repair-station information explains the regulatory framework. Verify the current scope directly with the shop.
Costs and scheduling
The public website does not give a standard labor rate, panel-upgrade price, or certification fee. It directs customers to contact the shop, and says scheduling varies with project scope. Request a written scope that separates equipment, labor, testing, documentation, and other charges. Ask for an estimate of aircraft downtime and how additional work is approved if troubleshooting finds another issue.
What to verify before scheduling
Describe the installed equipment and the issue as precisely as possible. Ask which testing or certification applies, what aircraft records should be provided, and whether the work requires the aircraft to remain at KBGF. Confirm the anticipated schedule and the shop's process for communicating progress or revised estimates.
For a panel upgrade, ask how layout decisions, equipment compatibility, approved data, and final system testing will be handled. For troubleshooting, ask which diagnostic steps are included in the initial estimate. Do not assume a service listed on the website is available immediately.
The mechanic directory contains other source-dated listings. The airport directory provides airport reference records, not shop access or scheduling details. Contact Thom Duncan Avionics directly to confirm current services and terms.