CABIN RPT REGARDING SEVERE TURB. SEAT BELT SIGN WAS ON AND PAX INJURY WAS DUE TO FLYING JUICE CAN FROM GALLEY. CABIN ATTENDANT INJURY OCCURRED BECAUSE THEY WERE UP AND JUST STARTING SEAT BELT CHK. TURB LASTED ABOUT 10 MINS. TURB ACTIVATED SMOKE ALARM IN LAVATORY.

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THE FLT PLAN PREDICTED MODERATE TURB NEAR NEW YORK. CAPT TOLD US TO BE DONE WITH SVC BEFORE THEN. UNEXPECTED SEVERE TURB HIT US 1 HR INTO FLT; 60 MI S OF CHARLESTON. CAPT NOTED STREAM OF CLOUDS AHEAD; TURNED ON SEAT BELT SIGN; ANNOUNCEMENT MADE TO PAX TO CHK SEAT BELTS. I WAS WALKING INTO CABIN TO CHK BELTS; HIT A FEW MODERATE BUMPS; GRABBED HANDLE IN GALLEY WALL. PAX HELD MY HAND TILL I COULD GET TO A SEAT. MY JUMP SEAT WAS BLOCKED BY MEAL CART USED FOR TRAY SET-UP. 2 PAX HAD COFFEE SPILLED ON THEM IN MAIN CABIN; 1 BOY IN MAIN CABIN HIT IN HEAD BY JUICE CAN THROWN OUT OF GALLEY COMPARTMENT. R HAND AFT LAVATORY SMOKE ALARM SET OFF BY JOLT OF TURB; WAS ABLE TO RESET AFTER FLT SMOOTHED OUT. NO ONE IN FIRST CLASS WAS HURT; JUST SOME DROPPED OBJECTS. I HIT ONE KNEE AGAINST WALL; THE OTHER 2 FLT ATTENDANTS IN MAIN CABIN WERE IN THE AISLE WITH BEVERAGE CART. THEY WERE BOUNCED AROUND AND OFF THE FLOOR SEVERAL INCHES. THEY WERE BRUISED AND STRAINED SOME MUSCLES BUT NO SERIOUS INJURIES. I FELT ANXIOUS BUT KNEW WE AND THE PLANE WERE OKAY. THE OTHER 2 FLT ATTENDANTS WERE NOT SO SURE; BECAUSE THE FURTHER BACK THE MORE YOU FEEL BUMPS AND THEY HEARD WHAT THEY THOUGHT WAS AN UNUSUAL NOISE AS WE DSNDED. THE COCKPIT LATER TOLD US THE NOISE WAS THE SPD BRAKES. DURING THE TURB IT WAS NOT POSSIBLE TO DO ANYTHING BUT LOOK OUT FOR OURSELVES; DUE TO QUICKNESS OF ONSET AND THE FACT THAT WE WERE THE ONLY PEOPLE NOT STRAPPED IN. ALL PAX WERE SEATED AND BELTED AT THE TIME. INSERTS CAME OUT OF THE BEVERAGE CART IN THE AISLE AND GALLEY COMPARTMENTS IN MAIN CABIN. BINS STAYED CLOSED. THE CLOSETS STAYED CLOSED; BUT THE GARMENT BAGS ALL FELL OFF THE RUNG. TURB LASTED APPROX 10 MINS.