B767-300 ENCOUNTERS MODERATE TURB RESULTING IN INJURY TO A PAX AND A FLT ATTENDANT.

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OUR FLT OPERATED FROM MCO TO CVG. MODERATE TURB WAS ENCOUNTERED WHILE IN CRUISE AT FL350. I WAS CAPT UNDERGOING IOE TRAINING WITH A COMPANY CHK AIRMAN. NEAR ATL WE DSNDED AT ATC DIRECTION FROM FL370 TO FL350 AND FROM VMC INTO MARGINAL IMC. AS WE APCHED THE ODF VOR; OUR RADAR DEPICTED A LINE OF LEVEL 2 AND 3 TSTMS AHEAD OF US ORIENTED W TO E ACROSS OUR FLT PATH. DISPATCHER HAD FOREWARNED US VIA ACARS OF THE WX AND THE POSSIBLE NEED TO DEVIATE TO THE W. AFTER DISCUSSION WITH EACH OTHER AND ATC; WE BEGAN A DEV TO THE W AND THE CHK CAPT ADVISED THE FLT ATTENDANTS TO SUSPEND SVC AND TAKE THEIR SEATS. SHORTLY THEREAFTER; HE MADE A PA CAUTIONING THE PAX TO STAY SEATED. THE SEATBELT SIGN WAS ON. I CHOSE TO FLY A COURSE THAT TOOK THE ACFT BTWN 2 LEVEL 2 STORMS (AS DEPICTED ON OUR RADAR) THAT WERE SEPARATED BY ABOUT 40 NM. THE WIND WAS OUT OF THE W AT ABOUT 40 KTS AND I KEPT ABOUT 30 NM ABEAM; AND DOWNWIND OF; THE NEAREST UPWIND CELL. FLT CONDITIONS BTWN THE CELLS WERE IMC AND SMOOTH. AFTER PASSING THROUGH THE GAP BTWN THE CELLS; AND AFTER ATC HAD QUERIED US ABOUT THE RIDE; WE ENTERED MODERATE TURB THAT LASTED ABOUT 10-15 SECONDS. ABOUT 10 MINS HAD ELAPSED SINCE OUR FIRST WARNING TO THE FLT ATTENDANTS AND PAX. AT LEAST 1 FLT ATTENDANT WAS APPARENTLY NOT SEATED. SHE WAS THROWN OFF HER FEET AND SUFFERED A NECK INJURY OF UNDETERMINED SEVERITY. 1 PAX; GIRL OF 9 YRS OLD; WAS IN THE AISLE AND WAS BRUISED WHEN SHE FELL AGAINST A SEAT. DISPATCHER WAS NOTIFIED AND PARAMEDICS RESPONDED TO THE GATE AT CVG. THE YOUNG PAX WAS EXAMINED AND SENT ON HER WAY WITH HER PARENTS. A CVG FLT ATTENDANT SUPVR MET THE ACFT AS WELL AND LEFT WITH THE INJURED FLT ATTENDANT. SUPPLEMENTAL INFO FROM ACN 579806: FLT ENCOUNTERED MODERATE TURB FOR APPROX 15 SECONDS RESULTING IN MINOR INJURIES TO 2 PEOPLE; A CHILD AND A CREW MEMBER. THERE WAS A COLD FRONT IN THE VICINITY OF ODF PRECEDED BY A LINE OF CONVECTIVE ACTIVITY. FLT DISPATCH ADVISED US OF THE WX. THE SEAT BELT SIGN WAS TURNED ON 60 MI PRIOR TO THE WX. AN INTERPHONE CALL TO THE FLT ATTENDANTS WAS MADE TELLING THEM I WOULD LIKE THEM TO BE SEATED IN ABOUT 5 MINS. A PA WAS MADE ABOUT 5 MINS LATER TELLING THEM AND THE PAX ABOUT THE WX AND ASKING THE FLT ATTENDANTS TO SIT DOWN. 5 MINS LATER; WE ENCOUNTERED THE TURB. WE CROSSED THE WX THROUGH A 40 MI HOLE. THE TURB WAS ENCOUNTERED AFTER WE PASSED THE WX. THE FLT ATTENDANTS HAD NOT YET TAKEN THEIR SEATS AND WERE TRYING TO FINISH A BEVERAGE SVC. THE CHILD WAS UNABLE TO RETURN TO HER SEAT BECAUSE OF A CART IN THE AISLE BLOCKING HER WAY AND SUFFERED A BRUISE ON HER SIDE. WHEN ASKED WHY THEY DID NOT TAKE THEIR SEATS; ONE REPLIED; 'I THOUGHT WE HAD 5 MINS.'