Launches have been postponed or scrubbed because of a boat, ship or aircraft entering the launch corridor. Before each launch, the area surrounding the launch pad is evacuated, and notices to aviators and boatsmen to avoid certain locations on launch day are given. The borders of the launch corridor are called the destruct lines. The exact coordinates of the launch corridor are dependent on weather and wind directions, and the properties of the launch vehicle and its payload. Launch vehicles are only allowed to fly inside a designated area, the launch corridor. The S-IVB stage of the Saturn 1B and Saturn V rockets did this with a command to the range safety system to remove its own power. When the launch vehicle is no longer a threat, the range safety system is typically safed (shut down) to prevent inadvertent activation. The signal levels seen by the range safety receivers are checked before launch and monitored throughout flight to ensure adequate margins. Range safety transmitters operate continuously at very high power levels to ensure a substantial link margin. Reliability is a high priority in range safety systems, with extensive emphasis on redundancy and pre-launch testing. Supporting the RSO for this information were a supporting team of RSOs reporting from profile and horizontal parallel wires used at lift-off (before radar technology was available) and telemetry indicators. These included booster chamber pressures, vertical plane charts (later supplanted by computer-generated destruct lines), and height and speed indicators. To assist the range safety officer (RSO) in making a flight termination decision, there are many indicators showing the condition of the space vehicle in flight. Flight termination could also be triggered autonomously by a separate computer unit on the rocket itself. This activates explosives placed in specific parts of the vehicle to eliminate any means with which it could endanger anyone or anything on the ground. Usually, a range safety officer (RSO) commands the flight or mission to end by sending a signal to the flight termination system (FTS) aboard the rocket. In rocketry, range safety or flight safety is ensured by monitoring the flight paths of missiles and launch vehicles and implementing various measures to protect nearby people, buildings and infrastructure if one malfunctions or veers off course mid-flight. The Delta 3914 rocket carrying the GOES-G satellite was given the destruct command by the range 91 seconds after launch due to an electrical failure that shut one of the engines down.
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