B737-400 FLT ATTENDANT WAS INJURED WHILE OCCUPYING THE COCKPIT JUMP SEAT FOR LNDG; WHEN A GALLEY CART BROKE LOOSE AND ROLLED THE ENTIRE LENGTH OF THE CABIN AND THEN THROUGH THE OPEN COCKPIT DOOR AND STRUCK HER.

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DEPARTED SAN NON A NO PAX FLT TO SEA; WITH 2 FLT DECK CREW MEMBERS AND 3 WORKING FLT ATTENDANTS. PRIOR TO TOP OF DSCNT INTO SEA; FIRST FLT ATTENDANT (A) ELECTED TO OBSERVE LNDG INTO SEA. THE FLT ATTENDANT WAS SEATED AND WITH SEATBELT BUCKLED PRIOR TO TOP OF DSCNT. UPON LNDG IN SEA AND SLOWING ACFT FOR RWY EXIT; A GALLEY CART FROM THE BACK AFT GALLEY CAME LOOSE AND ROLLED DOWN ENTIRE LENGTH OF ACFT AISLE. THE GALLEY CART RAMMED INTO THE BACK OF JUMP SEAT. THE FLT ATTENDANT WAS INJURED AND THE JUMP SEAT WAS BROKEN. THE COCKPIT DOOR WAS OPEN AT TIME OF INCIDENT; AGAIN DUE TO NO PAX ON BOARD ACFT. CAUSE OF INCIDENT WAS IMPROPER SECURING AFT GALLEY CART. SUPPLEMENTAL INFO FROM ACN 538471: I LOWERED THE NOSE TO THE RWY AND APPLIED THE THRUST REVERSERS. MOMENTS LATER I FELT AND HEARD A LOUD CRASH IN THE COCKPIT. I GLANCED OVER MY L SHOULDER AND SAW THE FLT ATTENDANT SLUMPED TO THE L. I SLOWED THE ACFT TO TAXI SPD AND THE CAPT TOOK OVER TAXIING THE ACFT. I COMPLETED THE FO AFTER LNDG FLOWS AND THE AFTER LNDG CHKLIST. I COORDINATED WITH GND CTL FOR TAXI CLRNC TO THE GATE. I ALSO RADIOED SEATTLE OPS TO HAVE EMT PERSONNEL MEET THE AFT. AT THE GATE TO ATTEND TO THE FLT ATTENDANT IT WAS UNKNOWN AT THIS TIME WHAT HER INJURIES WERE. BY THIS TIME THE OTHER FLT ATTENDANTS WERE ASSISTING THE INJURED FLT ATTENDANT. AFTER ARR AT THE GATE; I WAS TOLD THAT A BEVERAGE CART FROM THE AFT GALLEY HAD MOVED FORWARD THE ENTIRE LENGTH OF THE ACFT AND HAD STRUCK THE JUMP SEAT. THE IMPACT DAMAGED THE JUMP SEAT. EMT PERSONNEL EXAMINED THE FLT ATTENDANT AND RELEASED HER. THE CAPT AND I FILLED OUT A FORM. A GND SUPVR TOOK DIGITAL PHOTOS. IT WAS MY UNDERSTANDING THAT WE WERE REPOSITIONING THE ACFT FROM SAN TO SEA FOR THE NEXT DAY'S FLTS. EVEN THOUGH WE DID NOT HAVE A FERRY FLT CALL SIGN; I DID NOT FEEL THAT WE WERE OPERATING UNDER FAR PART 121 (NO PAX OR CARGO). HAVING THE FLT ATTENDANT IN THE COCKPIT WAS FOR HER FAMILIARIZATION OF COCKPIT DUTIES DURING THE LETDOWN/LNDG PHASE OF FLT. HAVING THE FLT ATTENDANT IN THE COCKPIT OR HAVING THE COCKPIT DOOR OPEN DID NOT CREATE A DISTR OF ANY KIND (LIGHT; NOISE; ETC).