PLT AS PAX ON FOREIGN CARRIER ENCOUNTERING TURB CONCERNED ABOUT LACK OF ATTN CABIN CREW GAVE TO INJURED PAX AFTER THE ENCOUNTER.

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RPTR IS 25 YR AIRLINE PLT WITH MAJOR UNITED STATES CARRIER. CURRENTLY SERVING AS LINE CHK AIRMAN ON B737-300. CAPT FOR 14 YRS ON AIRLINE JETS. ROLE IN EVENT WAS PAX. LEVEL CRUISE CONDITIONS SMOOTH ABOVE CLOUDS; VIDEO ENTERTAINMENT SYS RPTING ALT 9934 METERS ABOVE LONDON; UNITED KINGDOM; SEATBELT SIGN OFF. FLT ATTENDANTS CONDUCTING MEAL SVC (CARTS NOT VISIBLE IN AISLE); MOST PAX SEATED. ACFT BEGAN STRONG R ROLLING MOTION TO ESTIMATED 40-45 DEG R BANK; FOLLOWED IMMEDIATELY BY L ROLL TO ESTIMATED 60-70 DEG L WING DOWN. VERY RAPID ROLL IN BOTH DIRECTIONS; L ROLL IMMEDIATELY FOLLOWED BY STRONG NEGATIVE G'S (ESTIMATED 1.5 - 2 G'S). RPTR PERSONALLY OBSERVED 2 PAX SLAMMED TO CEILING OF AFT CABIN AREA. ALL DRINKS AND LOOSE OBJECTS IN AFT CABIN WERE ON CEILING. AFTER ESTIMATED 1.5 SECONDS; STRONG POSITIVE G'S (ESTIMATED 2.5 G'S) FORCEFULLY REDISTRIBUTED ALL OF ABOVE TO THE FLOOR OF THE CABIN. PAX SUFFERED SEVERAL INJURIES DURING HIS MOVEMENTS THROUGH THE CABIN. BUMP ON HEAD; BLEEDING SCRAPE ON KNEE; LARGE/DEEP CUT ON FOREARM (TO THE BONE). RPTR AND SPOUSE ASSISTED INJURED PAX IN APPLYING PRESSURE TO FOREARM CUT; BUT CONCERN ABOUT ADDITIONAL TURB PREVENTED US FROM LEAVING OUR SEATS. RPTR BEGAN RINGING FLT ATTENDANT CALL BELL TO REQUEST ASSISTANCE ABOUT 3 MINS AFTER EVENT. AFTER 5 MINS; FLT ATTENDANTS WERE OBSERVED IN FORWARD COACH CABIN RESUMING MEAL SVC. AT THIS POINT; NO UNIFORMED AIRLINE EMPLOYEE HAD PROCEEDED AFT OF ROW XX SINCE THE ENCOUNTER. 14 MINS AFTER ENCOUNTER; A FLT ATTENDANT WITH A BREAD BASKET APCHED. RPTR REQUESTED MEDICAL ASSISTANCE FOR INJURED PAX. FLC RESPONSE AFTER REQUEST APPEARED TO MATCH STANDARDS EXPECTED OF UNITED STATES CARRIERS. FLT ATTENDANTS ON RPTR'S CARRIER; FACED WITH A SIMILAR SIT; WOULD HAVE WAITED FOR AN OK FROM THE COCKPIT AND THEN CHKED THE CONDITION OF EVERY PAX ON THE ACFT. THEY WOULD HAVE THEN ASSISTED IN CLEANING AND RESECURING PAX AND BELONGINGS. GIVEN THE PRELIMINARY INDICATIONS; THAT DELAYED RESPONSE MAY HAVE BEEN IMPLICATED IN THE LOSS OF SOMETHING -- I WAS STUNNED TO SEE THE POOR/NONEXISTENT RESPONSE TO THIS INFLT PROB. UNITED STATES CARRIERS SHOULD CAREFULLY CONSIDER MARKETING ALLIANCES WITH FOREIGN CARRIERS WHOSE SAFETY STANDARDS DO NOT MEET UNITED STATES STANDARDS.