A300 CREW ENCOUNTERED SEVERE TURB DSNDING INTO MMMX.

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CLR AIR TURB IS UNFORESEEN; I ONLY WISH OUR PAX WOULD TAKE THE SEAT BELT SIGN SERIOUSLY. FLT ATTENDANTS ARE TRAINED FOR SAFETY. WE ARE ALSO TAUGHT NOT TO ACT AS POLICE OFFICERS! I MADE REPEATED ANNOUNCEMENTS FOR PAX TO OBSERVE THE SEAT BELT SIGN. MEXICO CITY APCH IS NORMALLY BUMPY AND IS FELT MORE WHEN ACFT IS LIGHT WT; AND STILL THERE WAS A 2 YR OLD CHILD PLAYING IN THE AISLE. PARENTS FEEL IT IS NOT NECESSARY TO RESTRAIN THEIR CHILDREN. IT'S DIFFICULT TO VISUALLY ASSURE OVERWT PAX ARE SECURED WITHOUT SEEMING INSENSITIVE. IT'S A NO WIN SIT. WHEN WE HIT SEVERE TURB I WAS STANDING IN FIRST CLASS AREA BTWN COCKPIT DOOR AND FIRST CLASS LAVATORY. FLT ATTENDANT #5 WAS STANDING FORWARD FACING IN GALLEY AREA IN FRONT STORAGE COMPARTMENTS. FLT ATTENDANT #3 WAS BY 1L JUMP SEAT. I TRIED HOLDING ON TO HAND HOLD BY THE GALLEY OVEN AND FIRST CLASS LAVATORY DOOR HOPING NOT TO HIT CEILING; USING MY KNEES AS SHOCK ABSORBERS TRYING TO GO ALONG WITH THE MOTION OF THE ACFT UP AND DOWN. FLT ATTENDANT #5 HELD HERSELF ON HAND HOLD OF STORAGE COMPARTMENT IN GALLEY WITH THE OTHER HAND UP ON CEILING AS SVC ITEMS WERE FLYING OVER HER HEAD. SHE WAS FORTUNATE NOT TO BE HIT WITH ITEMS. SHE EXPERIENCED BACK MUSCLE STRAIN. I NOTICED HER KNEES WERE IN LOCKED POS AS SHE TRIED NOT TO HIT CEILING. FLT ATTENDANT #3 WAS ABLE TO JUMP IN TO JUMP SEAT 1R AND SECURE HERSELF. AFTER CABIN WAS STILL WE WALKED THROUGH CABIN TO ASSESS CONDITIONS. ALL PAX WITH BEVERAGES LOST THEIR BEVERAGES. THE FEW WITH TRAYS; LOST THEIR TRAYS. THESE ITEMS FLEW AROUND AND SPILLED. FORTUNATELY THE MOTHER WITH BABY IN FIRST CLASS HAD SEAT BELT FASTENED AND HAD BABY TIGHT IN ARMS. WE FOUND A PAX IN XXD HAD HIT CEILING COMPARTMENT; CRACKED HIS HEAD. HE OBVIOUSLY REMOVED HIS SEAT BELT (PERHAPS BECAUSE HE WAS A BIT OVERWT AND WASN'T COMFORTABLE (MY GUESS)). IN THE BACK GALLEY FLT ATTENDANT #7 WAS SLAMMED AROUND AS FLT ATTENDANT #4 HELD OR TRY TO HOLD HER DOWN WITH HIS FOOT. FLT ATTENDANT #4 WAS ABLE TO STRAP IN INTO 4R JUMP SEAT. #2 FLT ATTENDANT EXPERIENCED BACK MUSCLE STRAIN. FLT ATTENDANT #6 WAS ABLE TO GET INTO SEAT.