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Glossary - R RA. See resolution advisory. Radar attenuation. The absorption or reflection of radar signals by a weather cell, preventing that radar from detecting any additional cells that might lie behind the first cell. RAIM. See receiver autonomous integrity monitoring. Receiver autonomous integrity monitoring. The selfmonitoring function performed by a TSO-129 certified GPS receivers to ensure that adequate GPS signals are being received at all times. The GPS will alert the pilot whenever the integrity monitoring determines that the GPS signals do not meet the criteria for safe navigation use. Receiver autonomous integrity monitoring. The selfmonitoring function performed by a TSO-129 certified GPS receiver to ensure that adequate GPS signals are being received at all times. The GPS alerts the pilot whenever the integrity monitoring determines that the GPS signals do not meet the criteria for safe navigation use. Resolution advisory (RA). A warning issued by the Traffic Collision Avoidance System (TCAS) indicating an immediate threat of collision with another aircraft. This warning takes the form of a command to perform a vertical avoidance maneuver (e.g., “Climb! Climb!”) These commands are products of TCAS II equipment. These commands take precedence over ATC instructions, but must be reported to ATC immediately upon receipt and execution. Risk homeostasis. A term coined by psychologist Gerald J. S. Wilde, a tendency for humans to seek target levels of risk. RNAV. See Area Navigation. RNAV (GPS) approach. An approach procedure based on GPS signals for guidance. Route discontinuity. A point of uncertainty in a route that has been programmed into an FMS/RNAV. Most systems display this message when there is no routing to connect the last waypoint to the next point, or there is a missing next point. FMS/RNAV units will not plan to go direct unless certain programming parameters are met. |
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