SMOKE IN COCKPIT RESULTED IN THE FLC DONNING OXYGEN MASKS TO BREATH. NO WAY TO COM WITH ATC SINCE THE MASK DID NOT HAVE BUILT-IN MIKES.

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COMING FROM SIOUX FALLS; SD; TO MKC ON ACR X FLT NUMBER (SCHEDULED RUN) AND WHILE ON A 7000 FT MSL DOWNWIND TO RWY 1L; WE EXPERIENCED COCKPIT SMOKE (YELLOW IN COLOR) COMING FROM THE FO'S WINDSHIELD R LOWER CORNER. ADVISED ATC; COMPLETED MEMORY ITEMS AND DID ALL CHKLISTS AS PER OUR TRAINING AND LANDED UNEVENTFULLY. SMOKE DISSIPATED IMMEDIATELY AFTER DUMPING CABIN AND SHUTTING DOWN WINDSHIELD ANTI-ICE. WINDSHIELD WAS TURNED ON BECAUSE OF TWR RPTS OF LARGER BODIES OF MIGRATING BIRDS. DID NOT DECLARE AN EMER; JUST ASKED TO BE #1 FOR THE ARPT; WHICH ATC DID. DISCOVERED THAT WINDSHIELD ON FO'S SIDE WAS THE CAUSE OF SMOKE. AN ELECTRIC WIRE HAD GOTTEN LOOSE AND BURNED SOME RUBBER AT THE CONNECTION POINT. WHAT IS INCREDIBLE IS THAT THE FAA CERTIFIED THIS AIRPLANE FOR PART 25 AND IT DOESN'T HAVE BOOM MIKES OR OXYGEN MASKS AND WE DON'T EVEN REQUIRE GOGGLES. IF SMOKE WOULD HAVE BEEN DENSE; WE WOULD HAVE NOT BEEN ABLE TO SEE OR TALK TO ATC. GOD KNOWS IF WE EVER WOULD HAVE MADE IT TO THE ARPT. CAN YOU GUYS PASS THIS TO THE FAA? THE TYPE OF AIRPLANE IS A BEECH 1900C MODEL FLOWN BY ACR X.