LOSS OF ACFT CTL IN RAMP OP AS SMT STARTS TO MOVE AFTER ENGS ARE STARTED. NO HYD PRESSURE.

Narrative

AFTER TAKING MY SEAT IN THE COCKPIT; FOLLOWING MY PAX BRIEFING; THE ENGS WERE STARTED. I WAS BENDING DOWN TO SET UP SOME TOUR AUDIO TAPES AND TO WRITE DOWN THE START TEMPS ON THE ENGS; WHEN I REALIZED THE ACFT WAS MOVING. I LOOKED UP TO SEE WHY AND WHERE WE WERE TAXIING SINCE WE HAD NOT YET TURNED ON THE RADIOS OR INTERCOM NOR COMPLETED THE AFTER START CHKLIST. WHEN I LOOKED UP I QUICKLY REALIZED THE CAPT DID NOT MEAN FOR US TO TAXI. WE WERE HDG STRAIGHT ACROSS THE RAMP TOWARD A COMPANY AIRPLANE PARKED WITH ITS NOSE TOWARD US. I COULD SEE OUT OF THE CORNER OF MY EYE THE CAPT WAS TRYING TO TURN OUR AIRPLANE WITH THE TILLER BAR AND THEN HE REACHED FOR THE MAIN CIRCUIT BREAKER PANEL TO ATTEMPT TO RESET THE HYD CIRCUIT BREAKER. I TRIED TO STOP THE PLANE BY APPLYING MY BRAKES FULL FORCE; BUT IT HAD NO EFFECT. THE CAPT THEN PULLED THE PWR LEVERS TO FULL REVERSE AND STOPPED THE FORWARD MOVEMENT AND HE SHUT DOWN BOTH ENGS. PROBABLE CAUSE: IT HAS BEEN THE PRACTICE OF MOST FO'S TO PULL THE HYD CIRCUIT BREAKER WHILE PREFLTING THE REAR OF THE PLANE; AND MOST CAPTS DO THE SAME SO THEY CAN PUMP DOWN THE HYD SYS TO CHK THE PRESSURE ON THE ACCUMULATORS. IF THE HYD CIRCUIT BREAKER WAS NOT RESET THERE WOULD BE NO BRAKES OR NOSEWHEEL STEERING. THIS WAS PROBABLY THE CASE. CONTRIBUTING TO THIS IS THAT MY COMPANY DOES THE BEFORE START CHK SINGLE PLT; THE CAPT DOES THIS ALONE; AND HYD PRESSURIZATION SHOULD BE NOTED THERE. ALSO A CONTRIBUTING FACTOR COULD HAVE BEEN FATIGUE. WE HAD BOTH GOTTEN UP AT XA30 AM TO GET READY FOR WORK AND HAVE BEEN WORKING TYPICALLY 10 HRS PER DAY; 5 DAYS PER WK. CORRECTIVE ACTIONS: PLTS SHOULD NOT PULL THE HYD CIRCUIT BREAKER OR ANY CIRCUIT BREAKER TO USE IT AS AN ON/OFF SWITCH. ALL CHKLISTS SHOULD BE DONE AS CHALLENGE/RESPONSE BTWN THE CREW.