AILERONS BECAME STUCK ON A PIPER SEMINOLE; PA44; DURING A TRAINING FLT CAUSING THE INSTRUCTOR PLT TO DECLARE AN EMER AND MAKE A STRAIGHT-IN TO RWY DUE TO A LACK OF CTLING THE ACFT'S ROLL WITH ONLY RUDDERS.

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THIS WAS A TRAINING FLT WHERE THE APPLICANT WAS TRAINING FOR HIS ATP CERTIFICATE. WE ENTERED THE PRACTICE PERFORMED STEEP TURNS; SLOW FLT; AND PWR OFF STALLS. I VECTORED THE STUDENT TO A NEW HDG AND THE STUDENT BEGAN PERFORMING AN ENG FAILURE INFLT CHKLIST. I INQUIRED WHAT HE WAS DOING; AND HE SAID THE ACFT WAS ACTING STRANGE; SO I TOOK THE CTLS AND FOUND THE AILERONS WERE FROZEN. I IMMEDIATELY TURNED BACK TOWARDS TRENTON ARPT. I REQUESTED LONG FINAL FOR RWY 34 BECAUSE THE ONLY WAY I COULD CHANGE HDG WAS THROUGH RUDDERS. I DECLARED AN EMER AND WAS CLRED TO LAND. THE EMER TRUCKS FOLLOWED ME TO THE RAMP WHERE WE SHUT DOWN. THE WING HAD CAUGHT THE RIVETS INSTALLED FROM SVC BULLETIN 725B ON THE AILERON. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT SUBSEQUENT MAINT INSPECTION FOUND THAT A PLASTIC TIE AROUND INTERNAL CABLES HAD BROKEN AND FALLEN ON THE AILERON CTL CHAIN AND BECAME LODGED IN THE AILERON SPROCKET CAUSING THE AILERON CTL MOVEMENT TO BE JAMMED. SINCE THERE WAS EVIDENCE OF THE PIPER SVC BULLETIN NUMBER 725B RIVETS RUBBING THE ADJACENT WING SKIN; THE WING SKIN WAS BENT UP TO HELP PREVENT THIS FROM HAPPENING. HOWEVER; MAINT PERSONNEL RECOMMENDED THAT FLUSH MOUNTED RIVETS BE INSTALLED TO PERMANENTLY PREVENT THIS FROM HAPPENING IN THE FUTURE. MAINT PERSONNEL ALSO COMMENTED TO RPTR THAT THIS PIPER SVC BULLETIN IS A KIT SUPPLIED BY THE MANUFACTURER AND HAS BEEN INSTALLED ON ALL 1979 PA44 ACFT FOR 15 YRS AND THIS IS THE FIRST ONE GIVING TROUBLE OF WHICH THEY ARE AWARE.