AN A300 ON TKOF CLB AT 3000 FT DECLARED AN EMER AND RETURNED TO THE DEP FIELD DUE TO STOP IN AILERON JUST L OF CENTER. FOUND FLOORBOARD SCREW MIGRATED INTO L AILERON TENSION REGULATOR; JAMMING AILERON.

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NORMAL PREFLT; START; AND TAXI FROM GATE TO RWY 18L; DAYLIGHT; VMC CONDITIONS. NORMAL OBSERVATIONS ON ALL CHKLISTS. NORMAL TKOF IN SLIGHT L TO R XWIND; FO WAS PF. NORMAL ROTATION AND LIFTOFF. DURING CLBOUT; THE ACFT BEGAN A SLIGHT R DRIFT AT APPROX 800 FT. FO INITIATED A MINOR HDG CORRECTION TOWARD THE L AND NOTICED A STOP IN THE YOKE AS AILERON WAS APPLIED SLIGHTLY TO THE L OF CENTER. THE JAM FELT AS IF HITTING A MECHANICAL STOP. FO NOTIFIED THE CAPT OF THE FLT CTL PROBLEM WHO DIRECTED A LEVEL OFF AT 3000 FT. WHILE LEVELING; CAPT SUGGESTED MAINTAINING CURRENT CONFIGURATION (GEAR UP/SLATS FLAPS 15/20). CAPT TOOK THE CTLS; VERIFIED THAT THE PROBLEM EXISTED IN BOTH YOKES AND HE THEN SELECTED THE #1 AUTOPLT ON. HE MAINTAINED ACFT CTL FOR THE REMAINDER OF THE FLT. AN EMER WAS DECLARED INDICATING A FLT CTL MALFUNCTION. THE CAPT THEN SELECTED 15 DEGS ANGLE OF BANK ON THE AUTOPLT AND SHALLOW L AND R TURNS WERE SUCCESSFULLY ACCOMPLISHED VERIFYING POSITIVE CONTROLLABILITY THROUGH AUTOPLT USE. A R PATTERN TO A 10 MILE FINAL FOR RWY 18C WAS REQUESTED AND APCH CTL WAS NOTIFIED THAT ALL TURNS WOULD BE SHALLOW. ON DOWNWIND; THE CAPT DIRECTED THE ONE JUMPSEATER ONBOARD (A CREWMEMBER QUALIFIED IN A DIFFERENT ACFT; BUT FROM THE SAME COMPANY) TO ENTER THE COCKPIT AND OCCUPY THE CENTER SEAT. HE WAS BRIEFED TO ASSIST AS DIRECTED AND TO MAINTAIN WATCH FOR ABNORMAL FLT PARAMETERS. HYDRAULIC PRESSURES AND QUANTITIES WERE CHKED AND NOTED THAT ONE SYSTEM QUANTITY WAS PEGGED FULL WHICH WAS VERIFIED ON THE HYDRAULIC PAGE. NO OTHER ABNORMALITIES NOTED. CAPT ELECTED TO USE DUAL AUTOPLTS TO 'NEAR' AUTOLAND WITH SLATS/FLAPS REMAINING AT THE CURRENT CONFIGURATION OF 15/20; LOW AUTOBRAKES. CAPT DISCONNECTED THE AUTOPLT JUST PRIOR TO TOUCHDOWN; APPROX 5 FT. NOTE; THE ACFT IS NOT CERTIFIED FOR AUTOLAND IN THAT CONFIGURATION. ACFT MAINTAINED A CTLED; STABLE PROFILE THROUGHOUT; TOUCHED DOWN ON CTRLINE IN THE TOUCHDOWN ZONE. UPON ROLLOUT; AFTER CONFIRMING POSITIVE NOSEWHEEL STEERING AND BRAKES; WE EXITED THE RWY AND RELEASED FIRE AND RESCUE CREWS. THE ACFT WAS TAXIED TO PARKING. THE ACFT HAD JUST RETURNED TO SVC FROM HVY MAINT. DURING THE WORK; SECTIONS OF THE COCKPIT WERE REMOVED DUE TO CORROSION ASSOCIATED WITH LEAKAGE FROM THE LAV. POST FLT MAINT REVEALED THAT A SCREW FROM THE FLOOR PANEL FELL AND BECAME LODGED IN THE L AILERON TENSION REGULATOR CAUSING THE JAMMED AILERON.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE MALFUNCTION WAS DISCOVERED ON TKOF CLB DUE TO A R DRIFT CAUSED BY A SLIGHT XWIND. ADDING; THE ACFT CTL WAS THROUGH #1 AUTOPLT AND WAS PRIMARILY USED UNTIL THE APCH WAS ACCOMPLISHED WITH BOTH AUTOPLTS ENGAGED. THE CAPT STATED THAT ON ROTATION; THE SCREW MIGRATED TO THE L AILERON TENSION REGULATOR CAUSING THE JAMMED AILERON.