Once cleared to the astern position, the refueling probe should be in line both laterally and vertically at what distance in trail of the drogue?

The correct distance in trail of the drogue for positioning the refueling probe is typically 10 to 15 feet. This distance allows for optimal alignment, providing both sufficient separation to avoid any interference between the aircraft and the drogue, while also ensuring that the probe can efficiently engage with the drogue when needed. Positioning the probe at this specific range helps maintain stability and control during the refueling operation, facilitating a smooth and safe connection. Additionally, this distance accounts for factors such as aircraft wake turbulence and lateral drift, critical in maintaining alignment in the astern position. Thus, the 10 to 15 feet range is considered the standard procedure for effective aerial refueling operations.