| Acronym | Meaning |
 | L-BAND | S-Band 390 To 1550 MHz |
| EDC | Engineering Design Change |
| LESS | Leading Edge Subsystem |
| PSL | Pressure Seal |
| IPS | IRIS Italian Research Interim Stage |
| FRSI | Felt Reusable Surface Insulation |
| SEADS | Shuttle EntrY Air Data System (Subsystem) |
| CIM | Computer Input Multiplexer |
| GESYOT | GCOS Program Element Name |
| RT | Real Time (R/T Preferred) |
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