What does the green ST READY light indicate during T-6A startup?

The green ST READY light during the T-6A startup process indicates that the engine is ready for operation. This light serves as an important status indicator for the pilot, confirming that the necessary systems are functioning correctly and that the engine is prepared for the next phase of flight operations. When this light illuminates, it signals that everything is in order for the engine to be started, allowing for a safe startup sequence. The presence of this light helps ensure that crew members can confidently transition into the operational phase of the aircraft, as it reflects a state of readiness for the engine to perform as expected.