A B747-400 PAX WAS INJURED FOLLOWING A FIRM LANDING WHEN A PROJECTOR COVER FELL ON HER HEAD.

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CAPT FLYING. CLRED FOR VISUAL APCH. AUTOPLT ON UNTIL 800 FT AGL. AUTOTHROTTLE ON THROUGH TOUCHDOWN; DISCONNECTED ON GND. WIND RPTED AT 1000 FT AGL 020 DEGS AT 8 KTS GUSTING 17 KTS. FO ASKED ABOUT CHANGING TARGET SPD FROM REF +5 KTS TO REF +5 KTS PLUS GUST. CAPT SAID AUTOTHROTTLE ON NOT NECESSARY. IN FLARE; AUTOTHROTTLE SPOOLED UP AND LANDED VERY FIRM. NO DEBRIEF OF APCH OR LNDG OCCURRED. CHKLISTS COMPLETED. CAPT AND RELIEF PLT WENT DOWNSTAIRS AND LEFT ACFT. FO INFORMED AS GOING DOWNSTAIRS THAT A WOMAN WAS INJURED DURING LNDG. MID-CABIN PROJECTOR COVER HAD DISLODGED DURING LNDG AND HIT WOMAN IN THE HEAD. FO AND FLT ATTENDANTS ATTENDED TO WOMAN AND CALLED FOR MEDICAL ASSISTANCE. WOMAN CONSCIOUS BUT IN MILD SHOCK. FO CALLED SAFETY COORDINATOR FOR FLT OFFICE ASSISTANCE AND WROTE UP DAMAGED COVER IN ACARS. MEDICAL ASSISTANCE RENDERED AND WOMAN HELPED OFF OF ACFT. SUPPLEMENTAL INFO FROM ACN 747045: THE SUBSEQUENT LNDG WAS A FIRM LNDG; YET NOT TO THE POINT THAT I FELT THERE COULD BE ANY DAMAGE. AFTER TAXI TO THE GATE AND SHUTDOWN I SHOOK THE HANDS OF THE 2 FLYING PLTS; SAID BYE TO THE UPPER DECK FLT ATTENDANTS AND LEFT FOR LAYOVER. AT THE HOTEL I RECEIVED A CALL AND WAS INFORMED THAT A PAX WAS INJURED ON THE LNDG.