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Duncan Aviation Provides Quick, Experienced TDR-94 and TDR-94D Service

As an Authorized Service Provider, Duncan Aviation can provide repair, service and ADS-B modification of TDR-94 and TDR-94D transponders — FAST.


Our avionics technicians have 40 years of combined experience on TDR-94 repairs and modifications. We support Collins part numbers of 622-9352-002 through -008; -108; -207; -308-311; -408-411; -500-501. We also provide ADS-B modification for earlier transponders up to -501s when properly installed and certified.


Duncan Aviation will provide same-day evaluations. Repairs have an average turntime of just three days. And when needed, same-day turns can be accommodated for a nominal fee when scheduled in advance. For same-day turns on ADS-B upgrades, schedule your transponders with any of our customer account representatives and they will work with you to acquire ID plate photos and other details so parts can be ordered in advance of your unit arriving at our shop. Duncan Aviation customers also have access to loaner transponder units.

Rockwell Collins Authorized

Duncan Aviation is the only independent service facility authorized to repair, modify and convert to ADS-B the TDR-94D to a -501. We have invested in an extensive inventory of parts and upgrade kits.

Location, Location, Location

The Duncan Aviation satellite shop network offers customers a local, one-stop ADS-B upgrade option for the TDR-94 that will reduce downtime, contain costs and guarantee upgrade success. To find the location nearest you, visit the locations page on our website.

Duncan Aviation NextGen Information & Solutions
Rockwell Collins TDR-94/TDR-94D Modifications Resume
Press Release

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TDR-94 Transponder Repair: Ramped Up and Ready for Transponder Service
Debrief Article

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Duncan Aviation Authorized to Service Rockwell Collins TDR-94/TDR-94D Transponders
Duncan Intelligence Article

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