FLC OF A SAAB340 RETURN LAND SHORTLY AFTER DEP DUE TO AN UNUSUAL AILERON CTL BINDING ABNORMALITY. FLC DID NOT DECLARE AN EMER.

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ON CLBOUT; CAPT (PF) NOTICED THAT THE AILERON CTLS WERE BINDING. CTLS WOULD BIND INITIALLY THEN RELEASE. CTLS APPEARED TO BIND IN NEUTRAL POS; LOTS OF FORCE NEEDED TO MOVE THEM. ONCE CTLS MOVED; THEY SEEMED TO RELEASE. THEN WHEN OPPOSITE FORCE APPLIED; CTLS WOULD AGAIN BIND. SINCE ACFT WAS STILL CTLABLE; NO EMER WAS DECLARED. COMPLIED WITH APPROPRIATE CHKLIST AND RETURNED TO MSP. UPON FURTHER REFLECTION WE PROBABLY SHOULD HAVE DECLARED AN EMER SINCE INCIDENT INVOLVED FLT CTLS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE MECH THAT MET THEM AFTER THEIR RETURN LAND ADVISED THAT THEY FOUND A SQUARED OFF PULLEY IN THE AILERON SYS DUE TO WEAR AND THAT IT WAS REPLACED. HE WAS ASKED IF HE HAD FLOWN OTHER SAME MAKE AND MODEL SF340A ACFT AND IF SO; EXPERIENCED A SIMILAR PROB. HE SAID THAT HE HAS FLOWN SEVERAL ACFT IN THE FLEET FOR 250 HRS; AND HAD NOT EXPERIENCED OR HEARD ANY OTHER PLTS COMMENT ON HAVING A SIMILAR EXPERIENCE. IN ADDITION; THERE WERE NO KNOWN PREVIOUS DISCREPANCY WRITE-UPS FOR THIS SAME PROB RECORDED IN THE ACFT LOGBOOKS.