A CESSNA 206 DURING RUN UP FOR TAKEOFF THE LEFT AILERON APPEARED HEAVY BUT OPERABLE. AFTER TAKEOFF EXPERIENCED LOSS OF L AILERON CONTROL.

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DURING THE PREFLT OF THE ACFT I NOTICED THE LEFT AILERON 'FELT HEAVY.' UPON RUN-UP THE AILERON STILL FELT HEAVY BUT SEEMED TO BE OPERATING CORRECTLY. UPON TKOF THE LEFT WING DIPPED SLIGHTLY; HOWEVER CONTROL OF THE AIRCRAFT WAS REGAINED PROMPTLY. IN THE TFC PATTERN EXCESSIVE R AILERON HAD TO BE HELD TO MAINTAIN LEVEL FLIGHT. AFTER LNDG; THE ACFT CONTROLS AGAIN APPEARED TO BE REACTING PROPERLY AND DURING THE SECOND TFC PATTERN THE SAME CONTROL INPUTS WERE NECESSARY TO HOLD LEVEL FLT; HOWEVER POSITIVE CTL OF THE ACFT WAS MAINTAINED AT ALL TIMES. THE ACFT WAS BROUGHT TO A FULL STOP; WHEREUPON FURTHER INSPECTION THE L AILERON WAS COMPLETELY UNRESPONSIVE. SOME FACTORS WHICH CONTRIBUTED TO THE SIT WERE I WAS FLYING FROM THE R SEAT AT NIGHT AND I HAD NOT FLOWN THAT PARTICULAR MODEL IN 6 MONTHS; AND I HAVE VERY LOW TIME IN THAT ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FAILURE OF THE L AILERON WAS THE AILERON CONTROL ROD BALL JOINT FITTING FOUND BROKEN DUE TO LACK OF GREASE. THE RPTR SAID THE TYPE OF CHK AND FREQUENCY OF THE CHK THAT REQUIRES LUBRICATION OF THIS COMPONENT IS UNKNOWN.