The flight control computer will turn the aircraft into the localizer and fly along the localizer. A typical approach will have the aircraft come in "below the glideslope" (vertical guidance) so the airplane will fly along the localizer (aligned to the runway centerline) until the glideslope is detected. At this point the autoland mode will change to CAT III and the aircraft will be flown by the flight control computer along the localizer and glideslope beams.