| Make | Collins |
|---|---|
| Model | TDR-90 ATC Transponder w UMT-11 |
| Condition | Used |
| Location | Goleta, CA , US |
| Date Listed | Aug 7, 2026 |
| Expires | Sep 6, 2026 |
Description
Collins TDR-90 ATC Transponder
Part Number: 622-1270-001
Serial Number: 25242
Mount: Collins UMT-11 Tray (included)
Genuine Collins TDR-90 Mode A/C transponder removed from operational aircraft N258AS . Shop verified “OPS TESTED Good Prior to Removal” with original yellow service tag. Clean unit with solid connectors — excellent condition for a legacy Collins transponder.
Key Features
Classic Collins ATC transponder (Mode A/C)
Includes matching UMT-11 mounting tray
Operationally tested good before removal
Clean multi-pin connectors
Reliable 1970s–1990s Collins Pro Line component
Compatibility
Commonly installed in 1970s–1990s general aviation and light turbine aircraft with Collins avionics stacks, including:
Cessna
Beechcraft
Piper
Many other GA aircraft
Usually paired with Collins CTL-92 control head.
Important: Legacy transponder — verify compatibility with your aircraft wiring, control head, and current ADS-B / 2020+ requirements before installation.
Condition
OPS Tested Good / Shop Stock
Removed from flying aircraft (N258AS)
Normal cosmetic wear only
30-Day Guarantee – Works as described or full refund (Seller pays return shipping)
What’s Included
Collins TDR-90 Transponder (622-1270-001)
Matching UMT-11 Mounting Tray
Shipping
Ships same or next business day from California, USA
Expert double-boxed avionics packaging
International shipping available via eBay Global Shipping Program
Notes
Collins TDR-90, TDR90, 622-1270-001, Collins ATC Transponder, UMT-11 Tray, Collins Transponder with Mount, CTL-92, Pro Line Avionics, Aircraft Transponder.
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