Narrative:

I was the flight instructor aboard C172. I had just completed slow flight with my student. I asked the student for a right clearing turn. As he raised the right wing, another high wing cessna was coming in head-on. I took the flight controls and immediately rolled the plane hard to the left. My aircraft barely turned. The other aircraft turned and we missed by less than 100 ft. I noticed in the left turn my rate on my plane was incorrect. I flew to X47 to inspect. I noticed nothing wrong on the ground. We took off from X47 and opted to test it in the air. The left turn was barely there and the yoke was very tight. I returned to my home airport of dab. Maintenance inspected and found a bad bearing on the pulley. My chief flight instructor agreed this was flight control failure. The NTSB was notified. I contacted FAA safety inspector at the miami field office. Mr abc agreed this was a flight control failure since the aircraft would not properly turn. Callback conversation with reporter revealed the following information: the reporter stated in executing maneuver during the near miss event it was noted the left aileron was tight and ineffective and a very slow rate of turn was accomplished. The reporter said a landing was made and the aircraft was ground checked by the reporter and student and a decision was made to fly the aircraft to the home station. The reporter said maintenance found the left aileron inboard pulley bearing frozen from lack of lubricant.

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Original NASA ASRS Text

Title: A CESSNA AT 2000 FT ON A TRAINING MISSION EXPERIENCES A NEAR MISS AND DURING EVASIVE ACTION INSTRUCTOR NOTES LACK OF L TURN CAPABILITY CAUSED BY FROZEN L INBOARD AILERON PULLEY BEARING.

Narrative: I WAS THE FLT INSTRUCTOR ABOARD C172. I HAD JUST COMPLETED SLOW FLT WITH MY STUDENT. I ASKED THE STUDENT FOR A R CLRING TURN. AS HE RAISED THE R WING, ANOTHER HIGH WING CESSNA WAS COMING IN HEAD-ON. I TOOK THE FLT CTLS AND IMMEDIATELY ROLLED THE PLANE HARD TO THE L. MY ACFT BARELY TURNED. THE OTHER ACFT TURNED AND WE MISSED BY LESS THAN 100 FT. I NOTICED IN THE L TURN MY RATE ON MY PLANE WAS INCORRECT. I FLEW TO X47 TO INSPECT. I NOTICED NOTHING WRONG ON THE GND. WE TOOK OFF FROM X47 AND OPTED TO TEST IT IN THE AIR. THE L TURN WAS BARELY THERE AND THE YOKE WAS VERY TIGHT. I RETURNED TO MY HOME ARPT OF DAB. MAINT INSPECTED AND FOUND A BAD BEARING ON THE PULLEY. MY CHIEF FLT INSTRUCTOR AGREED THIS WAS FLT CTL FAILURE. THE NTSB WAS NOTIFIED. I CONTACTED FAA SAFETY INSPECTOR AT THE MIAMI FIELD OFFICE. MR ABC AGREED THIS WAS A FLT CTL FAILURE SINCE THE ACFT WOULD NOT PROPERLY TURN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED IN EXECUTING MANEUVER DURING THE NEAR MISS EVENT IT WAS NOTED THE L AILERON WAS TIGHT AND INEFFECTIVE AND A VERY SLOW RATE OF TURN WAS ACCOMPLISHED. THE RPTR SAID A LNDG WAS MADE AND THE ACFT WAS GND CHKED BY THE RPTR AND STUDENT AND A DECISION WAS MADE TO FLY THE ACFT TO THE HOME STATION. THE RPTR SAID MAINT FOUND THE L AILERON INBOARD PULLEY BEARING FROZEN FROM LACK OF LUBRICANT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.