What indicates a successful initialization of the LS by the ECS?

The successful initialization of the Launch System (LS) by the Electronic Control System (ECS) is indicated by data received from the Defense Advanced GPS Receiver (DAGR). This is crucial because the DAGR provides essential positional and operational data that the LS needs to function effectively. When the ECS successfully communicates with the DAGR, it confirms that the system has established a reliable connection and is receiving the necessary navigational data to proceed with launch operations.

While power on indicator lights, calibration checks, and signal strength are all important components of the system's functionality, they do not specifically indicate that the LS has been successfully initialized by the ECS. Instead, the receipt of data from the DAGR shows that the initialization process has been completed and that the launch system is ready for further operations. Thus, the ability to receive and process data from the DAGR is a direct indicator of successful system initialization.