C206 PLT THOUGHT HE WAS CLRED TO LAND. HE BEGAN DSCNT AND DID NOT OBSERVE THE CHARTED VISUAL ALT LIMITATIONS FOR THE APCH. THE ATCT LCL CTLR ALERTED THE PLT AND HE CORRECTED HIS ALT.

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I WAS ON AN IFR FLT PLAN FROM DONNELLY; ID; TO SLC. ABOUT 15 MI N OF SLC I CANCELLED IFR AND REQUESTED TO PROCEED VFR. ZLC THEN ADVISED ME TO USE THE I-80 TRANSITION WHICH DICTATES TO FOLLOW ANTELOPE ISLAND SBOUND TO I-80 AND THEN EBOUND ALONG I-80 TO THE ARPT. AFTER A FEW MINS; CTR CLRED ME TO 6000 FT FROM THE PREVIOUSLY PRESCRIBED 9000 FT. AS I TURNED EBOUND ON I-80 AT 6000 FT; I CALLED THE TWR TO VERIFY THAT I WOULD BE LNDG RWY 35. TWR RESPONDED THAT I WOULD BE LNDG RWY 35 AND THAT I WAS CLRED TO LAND. I THEN DSNDED TO 5000 FT AND STARTED TO SET-UP FOR A LNDG. AS I REACHED 5000 FT TWR CALLED ME AND SAID THAT I WAS SUPPOSED TO BE AT 5500 FT OVER THE NUMBERS AT THE END OF THE RWY. I IMMEDIATELY ASCENDED TO 5500 FT AND CORRECTED MY HEADING TO FLY OVER THE NUMBERS. AS I PASSED OVER RWY 34R I COULD SEE A COMMERCIAL AIRLINER A FEW HUNDRED FEET OFF THE GND COMING IN FOR A LNDG. SINCE THE ARPT IS AT 4200 FT THERE WAS PROBABLY ABOUT 1000 FT CLRNC BTWN OUR PLANES. NO EVASIVE ACTION WAS TAKEN BY THE COMMERCIAL AIRLINER. I CALLED BACK TO THE TWR AND TOLD THEM THAT I THOUGHT I HAD BEEN CLRED FOR THE LNDG. THE TWR TOLD ME THAT I HAD NOT BEEN CLRED AND THAT I HAD PROBABLY HEARD THE CLRNC FOR SOME OTHER ACFT. THE PROB OCCURRED WHEN I THOUGHT THAT I HAD BEEN CLRED TO LAND. I NORMALLY AM IN THE HABIT OF REPEATING EVERYTHING BACK TO THE CTR OR TWR; BUT IN THIS SIT IT IS POSSIBLE THAT I WAS BUSY PREPARING FOR THE LNDG AND I MIGHT HAVE FORGOTTEN TO REPEAT THE INSTRUCTIONS BACK TO THEM. I BELIEVE THAT IF I WOULD HAVE REPEATED BACK THE INSTRUCTIONS THAT I THOUGHT I HAD HEARD THEN THE MISCOM WOULD HAVE BEEN RESOLVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE PLT THOUGHT HE WAS CLRED TO LAND; THAT IS WHY HE DSNDED BELOW THE ALT LISTED ON THE VISUAL ARR. HE WAS NOT SURE IF HE GAVE A CLRNC READBACK. THE PLT WAS NOT USING THE COMMERCIAL CHARTS OR THE DOD CHARTS; BUT WAS FAMILIAR WITH THE VFR I-80 ARR.