Primary Flight Display Symbols
Ground Roll Guidance
The Ground Roll Guidance Command Bar provides flight director yaw commands below 30 feet RA if localizer signal is available during takeoff with the RWY FMA displayed, or landing with the ROLLOUT FMA displayed. If the localizer signal is lost when RWY or ROLLOUT is engaged, the command bar provides lateral guidance based upon the runway track memorized prior to the failure. The command bar centers when the airplane is correcting toward the centerline at the commanded rate (e.g., used as steering bar to capture and maintain course).