| Abbreviation | Definition |
|---|---|
| TCS | Test Control Supervisor |
| TCS | Test Control System |
| TCS | Thermal Control Subsystem |
| TCS | Thermal Control System |
| TCSSS | Thermal Control SubSystem Segment |
| TCTI | Time Compliance Technical Instruction |
| TCU | Tape Control Unit |
| TCV | Temperature Control Voltage |
| TCV | Thrust Chamber Valve |
| TCXO | Temperature Controlled Crystal Oscillator |
| TD | Technical Directive |
| TD | Terminal Distributor |
| TD | Test Director |
| TD | Time Delay |
| TD | TouchDown |
| TD&SA | Telephone, Data, and Special Audio |
| TDA | Technical Data Analysis |
| TDA | Telecommunications and Data Acquisition |
| TDD | Task Description Document |
| TDM | Time-Division Multiplexing |