A CABIN BEVERAGE CART STRUCK AND DAMAGED THE COCKPIT DOOR OF A B727 DURING LNDG AFTER A FERRY FLT. THE FLC HAD PREFLTED THE CABIN AREA PRIOR TO DEP; BUT DID NOT NOTICE AN UNSECURED CART. THE CART HAD TRAVELED FROM THE REAR GALLEY FORWARD.

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I WAS COPLT OF A CREW ASSIGNED TO FERRY AN EMPTY ACFT FROM LGA TO DCA. WE BOARDED THE ACFT FROM THE REAR AIRSTAIR. THE CABIN APPEARED SECURE WALKING TO THE COCKPIT. ALL PREFLT DUTIES WERE ACCOMPLISHED. FLT WAS NORMAL AND UNEVENTFUL. AT THE COMPLETION OF THE LNDG ROLL AT DCA (SPD LESS THAN 30 KTS) A LOUD CRASH WAS HEARD AND THE COCKPIT DOOR SWUNG OPEN INTO THE COCKPIT (THE WRONG DIRECTION). IT WAS IMMEDIATELY ASCERTAINED THAT A BEVERAGE CART HAD SOMEHOW GOTTEN LOOSE AND ON DECELERATION OF THE ACFT HAD IMPACTED THE COCKPIT DOOR WITH ENOUGH FORCE TO PARTIALLY KNOCK THE DOOR OFF ITS HINGES. NO INJURIES RESULTED AND WE TAXIED TO THE GATE. I CANNOT SAY HOW THIS OCCURRED SINCE THE CABIN WAS CHKED AND SECURED PRIOR TO DEP. THE ONLY POSSIBLE EXPLANATION IS THAT ONE OF THE HANDLE LOCKS THAT RETAIN THE CATERING CARTS WAS LOOSE; AND DURING LIGHT TO MODERATE TURB WHICH WAS EXPERIENCED ON THIS FLT; WAS DISPLACED FROM THE LATCHED POS. SUPPLEMENTAL INFO FROM ACN 332293: THE SO DID HIS PREFLT AND NOTED THE CABIN WAS SECURE. HE ALSO WENT TO THE CABIN DURING THE FLT AND DID NOT SEE ANYTHING AMISS. THE MOVING CART IS A MYSTERY. AFTER LNDG AND EXAMINING THE CABIN WE FOUND ALL THE CARTS IN THE FORWARD GALLEY STOWED PROPERLY. EXPLANATION: A CART FROM THE REAR GALLEY SLOWLY MADE ITS WAY DOWN THE AISLE AND CRASHED INTO DOOR WHEN THE BRAKES WERE APPLIED. REMEDY: SOMEONE MUST BE ASSIGNED TO MAKE CERTAIN THAT GALLEYS ARE SECURE. SUPPLEMENTAL INFO FROM ACN 332281: THE ACFT WE WERE TO FERRY HAD GOTTEN BACK LATE FROM A CHARTER AND WAS PARKED OFF OUR GATES; DOWN AT THE BLAST FENCE. SINCE THE ACFT HAD RETURNED LATE IT WAS NOT DECATERED. I THINK THAT THE LACK OF FLT ATTENDANTS; WHO WOULD NORMALLY DOUBLE-CHK CARTS; AND THE FACT THAT WE WERE ON A HURRY-UP FERRY FLT BOTH CONTRIBUTED TO THE SIT.