LNDG GEAR DOOR POSITIONED IMPROPERLY BY AIRLINE MAINTENANCE.

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UPON RECEIVING ACFT FOR FIRST FLT OF THE DAY A NORMAL PREFLT INSPECTION WAS CONDUCTED BY THE F/O. F/O NOTICED MAINT WAS WORKING ON THE R/H. MAIN LNDG GEAR BRAKE FAN. PAX WERE BOARDED AND MAINT ADVISED MYSELF THAT THEY WERE GOING TO MEL THE BRAKE FAN. THE LOGBOOK WAS SIGNED AND ACFT RELEASED FROM MAINT. EVERYTHING WAS NORMAL UNTIL THE GEAR WAS SELECTED UP AFTER TKOF. THE R/H GEAR (RED LIGHT) NOT IN POSITION SELECTED LIGHT REMAINED ON. THE ABNORMAL CHECKLIST WAS CONSULTED AND CREW ELECTED TO RETURN TO THE FIELD. ACFT RETURNED TO THE GATE WHERE MAINT INSPECTED THE R/H GEAR AND FOUND THAT THEY FORGOT TO SECURE THE GEAR DOOR IN THE CORRECT POSITION. THE MECHANICS INVOLVED WERE EXPERIENCED PEOPLE WHO WERE RUSHED TO GET THE FLT OUT ON TIME. AS THE GEAR WAS RETRACTED; BUT THE GEAR DOOR WAS NOT; ACFT PERFORMANCE WAS NOT SIGNIFICANTLY EFFECTED. HOWEVER; IT IS THE EMPHASIS TO GET THE FLT OUT ON TIME THAT MAY BE DETRACTING FROM THE SAFETY AND THOROUGHNESS OF MAINT PROCEDURES. TO PREVENT THIS PARTICULAR OCCURRENCE FROM HAPPENING AGAIN I AM DETERMINED TO RE-CHECK MAINT'S POSITIONING OF THE GEAR DOORS WHENEVER WORK HAS OCCURRED ON TIRES OR BRAKES.