Aerospace Acronyms: R
| Acronym | Definition |
|---|---|
| Ramp Weight | maximum permissible weight of an aircraft. |
| RAPID | change expected to take place in thirty minutes or less, term used in met reports. |
| RAS (1) | Rectified Airspeed. Indicated airspeed corrected for instrument position error. |
| RAS (2) | Radar Advisory Service. |
| RASA | Radar Advisory Service Area. |
| RCL | Runway Centre-Line. |
| RBI | Relative Bearing Indicator, displaying information from the ADF. |
| RDO | Radio. |
| RIS | Radar Information Service. Provided to notify pilots of conflicting traffic outside regulated airspace, but offering no avoiding action. |
| RMI | Radio Magnetic Indicator. A navigation aid which combines DI, VOR and/or ADF display and will indicate bearings to stations, together with aircraft heading. |
| RMK | Remark(s). |
| RMU | Radio Management Unit. |
| Rnav | Area navigation. |
| RON | Remain Over Night (night-stop). |
| RT | Radio Telephony. Voice communications, as opposed to WT, wireless telegraphy. Also named RTF. |
| RVR | Runway Visual Range, a horizontal measurement of visibility along a runway. |
| RWY | Runway. |
| RX | Receiver. |
