AN S80 PIC ON BEGINNING OF TAXI DISCOVERS THAT HE CANNOT TURN THE NOSEWHEEL. A RATHER SUDDEN STOP OCCURS; HURTING A CABIN ATTENDANT. THE NOSE GEAR STEERING BYPASS PIN WAS STILL INSTALLED; WITHOUT A FLAG.

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AFTER COMPLETION OF A STRAIGHT BACK PWR BACK FROM GATE AT DFW; THE CAPT ATTEMPTED TO MAKE A R TURNOUT FOR TAXI BUT WAS UNABLE TO MOVE THE TILLER. THE CAPT IMMEDIATELY STOPPED THE ACFT WHICH RESULTED IN A SOMEWHAT ABRUPT STOP. HE SIGNALED THE GND CREW TO RETURN TO THE ACFT. UPON REESTABLISHING COM WITH THE GND CREW; THE CREW CHIEF DISCOVERED A STEERING BYPASS PIN INSTALLED WITHOUT A RED FLAG. APPARENTLY THE MAINT CREW HAD TOWED THE AIRPLANE IN THAT MORNING AND USED A PIN WITHOUT THE FLAG INSTALLED. THE TOW CREW NEGLECTED TO REMOVE THE PIN AFTER COMPLETING THE TOW. I; THE FO; MISSED THE PIN ON THE ORIGINATION PREFLT. IT IS NOT UNUSUAL TO HAVE THE PIN INSTALLED ON THE PREFLT AS THE ACFT COULD BE PUSHED BACK FOR THE DEP. BECAUSE OF THIS; I MAY HAVE BEEN A LITTLE LESS THAN DILIGENT IN OBSERVING THE BYPASS PIN. I WILL ATTEMPT TO BE MORE AWARE OF THE PRESENCE OF THE PIN IN THE FUTURE AND IN THE EVENT OF A PWR BACK; ENSURE THE CAPT COORDINATES FOR THE PIN TO BE REMOVED. IF THE PIN HAD THE RED STREAMER ATTACHED TO IT; I BELIEVE THE CREW CHIEF COULD HAVE SEEN IT PRIOR TO THE PWR BACK. IT IS FORTUNATE THAT IT WAS NOT A TURNING PWR BACK OR SERIOUS INJURY OR DAMAGE MAY HAVE RESULTED. PERHAPS A CHK OF ALL PINS SHOULD BE ACCOMPLISHED TO ENSURE THAT THE STREAMERS ARE SECURED PROPERLY. SUPPLEMENTAL INFO FROM ACN 427677: DUE TO THE PROX OF GND EQUIP MOVING IN FRONT OF THE ACFT AND MY INABILITY TO CTL DIRECTION OF THE ACFT; I STOPPED MORE ABRUPTLY THAN NORMAL. THE CREW CHIEF FOUND A STEERING BYPASS PIN INSTALLED WITHOUT A FLAG. HE STATED THAT HE HAD MISSED THE PIN BECAUSE OF THE LACK OF A FLAG. LATER I FOUND OUT THAT WHEN I STOPPED THE #2 FLT ATTENDANT WAS KNOCKED DOWN AND HURT HIS BACK.