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Model Number: TDR94D
Description: TRANSPONDER
Manufacturer COLLINS
Alternate Part Number
National Stock Number
Categories Transponders
Repair Capabilities YES
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Product Details

The TDR-94D Transponder replies to ground-based Secondary Surveillance Radar interrogations. The TDR-94D provides air traffic controllers with aircraft position identification, altitude and enhanced surveillance data. The TDR-94D is compatible with TCAS II receiver/transmitters that comply with RTCA document solid-state, crystal-controlled receiver/transmitter specifically designed for TCAS-II. The TCAS II system installations requiring antenna diversity.The TDR-94D Transponder is a Diversity version; i.e., it is capable of transmitting and receiving on either of two antennas. The TDR-94 is a non-diversity model. The TDR-94/94D can receive and send data link messages that are required for ATC automation. The added data link capability allows the transponder to perform additional air traffic control and airplane separation assurance (ASA) functions. The TDR-94/94D is an integral part of the Air Traffic Control Radar Beacon System (ATCRBS).

The TDR-94 or TDR-94D Transponder is normally mounted in a MMT-150 Modular Mounting Tray and controlled by an ATC control like the CTL-92/92A Control.  The TDR-94/94D operates in mode A by responding to normal beacon radar interrogations. This mode provides identification of transponder reequipped airplanes on the ground controller’s plan position indication (PPI). If the installation is equipped with a compatible altitude encoder, it can operate in mode C and provide altitude data long with the normal reply. In the mode S scheme, each airplane is assigned a unique identification code which allows automatic and unique interrogation and display of a specific airplane.

Part Number Differences:
Part NumberWithout Service Bulletins 6 & 10Mode A, C, S & Diversity Transponder With TCASCapable of Class 3A/ADS-B OperationsSourced With Digital/Gillham AltitudeCompatibility With GAMA Selected AltitudeICAO Track Angle RatePro Line 4/21 InstallationADS-B CompatibilityMode-S ALL-CallCSDB selected Altitude Pro line Fusion Installations Non- Collins TCAS Elementary/ Enhananced Surveillance
622-9210-002YesYesNoNoNoNo NoNoNoNoNoNoNo
622-9210-309NoYesYesYesYesNoYesNoYes Update Ground to AirNoNoYesYes
622-9210-310NoYesYesYesYesNoYesNoYes Update Ground to AirYesYesYesYes
622-9210-409NoYesYesYesYesNoYesYesYes Update Ground to AirNoNoYesYes
622-9210-410NoYesYesYesYesYesYesYesYes Update Ground to AirYesYesYesYes