| Acronym | Meaning |
![](file.png) | R | Roll |
![](file.png) | R | Yaw Rankine Rate |
![](file.png) | R | LEO Request Liaison Engineering Order |
![](file.png) | R | LSS Regenerative Life Support System |
![](file.png) | R | BARRadius Vector Axis |
![](file.png) | R | DOTRange Rate To Target |
![](file.png) | R | ETSReconfigurable Electrical Test Stand |
![](file.png) | R | ETSReconfiguration Electrical Test Stand |
![](file.png) | R | IMPMinimum Range To Avoid Plum Impingement |
![](file.png) | R&CC | Recorder And Communication Control |
![](file.png) | R&D | Research And Development |
![](file.png) | R&DO | Research And Development Operations (MSFC) |
![](file.png) | R&OA | Reliability And Quality Assurance |
![](file.png) | R&P | Reserve And Process |
![](file.png) | R&PM | Research And Program Management |
![](file.png) | R&R | Remove And Replace |
![](file.png) | R&R | Rendezvous And Recovery |
![](file.png) | R&Z | Range And Zero |
![](file.png) | R-T | Resistance Test |
![](file.png) | R/A | Radar Altimeter |
![](file.png) | R/C | Radio Command |
![](file.png) | R/C | Rate Of Climb |
![](file.png) | R/C | Remote Control |
![](file.png) | R/D | Rate Of Descent |
![](file.png) | R/E | Reentry |
![](file.png) | R/I | Receiving Inspection |
![](file.png) | R/L | Rate/Limited |
![](file.png) | R/L | Remote/Local |
![](file.png) | R/O | Rollout |
![](file.png) | R/S | Range Safety |
![](file.png) | R/S | RedundantSet |
![](file.png) | R/T | Real Time |
![](file.png) | R/T | Receiver/Transmitter |
![](file.png) | R/W | Read/Write |
![](file.png) | R/W | Runway |
![](file.png) | RA | Radar Altimeter |
![](file.png) | RA | Radar Altimeter (R/A Preferred) |
![](file.png) | RA | Radium |
![](file.png) | RA | Range Area |
![](file.png) | RA | Right Aft |
![](file.png) | RA | Right Ascension |
![](file.png) | RAAB | Remote Amplifier Acquisition And Advisory Box |
![](file.png) | RAAB | Remote Amplifier And Adoption Box |
![](file.png) | RAAB | Remote Application And Advisory Box |
![](file.png) | RAC | ReliabilitY Action Center |
![](file.png) | RACS | Rotation Axis Coordin |
![](file.png) | RACS | Remote Automatic Calibration System |
![](file.png) | RACU | Remote Acquisition And Command Unit |
![](file.png) | RAD | Radar |
![](file.png) | RAD | Radian |