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| Cessna 421 Garmin Stack |
| Agusta A109 GNC400 |
| Tri-State Avionics has a large hangar able to accommodate a variety of aircraft Agusta A109 Audio Panel/Intercom upgrade Piper Seneca Garmin Stack installation Citabria Garmin GNC250XL/Transponder/Intercom installation |
| Cessna 210 Garmin Stack |
| Cessna 182 Garmin Stack |
| Tri-State Avionics 3940 Cook Hangar Lane Rapid City, SD 57703 CRS#V5XR381Y 605-209-2103 |