If the ST READY annunciator is not illuminated during engine start, what does this indicate about auto start protection?

When the ST READY annunciator is not illuminated during engine start, it indicates that auto start protection is not provided. The ST READY light is a critical indicator of the aircraft's readiness for automatic start procedures. If this light is off, it suggests that the automatic protections and sequences normally in place to prevent issues during the engine start process are not active. This typically means that the pilot must be more vigilant and manual interventions may be necessary to ensure a safe engine start.

In this context, the other options do not accurately reflect the implications of the ST READY annunciator's status. Therefore, understanding the function of the ST READY indicator is crucial for safely managing engine start procedures in the T-6A aircraft.