INSTRUCTOR WITH SPI MAKES ACTUAL EMER LNDG WHILE PRACTICING EMER LNDGS.

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MY STUDENT AND I WERE PRACTICING ENG-OUT APCHS IN RURAL MIAMI COUNTY; KANSAS. I REDUCED HIS PWR BY RETARDING THE THROTTLE AT APPROX 3500 FT MSL. WE BEGAN OUR DESCENT; SELECTED A FIELD TO DSND INTO; AND BEGAN OUR APCH BY HDG OVER TO THE FIELD; AND THEN MAKING 360 DEG TURNS TO LOSE OUR EXTRA ALT OVER THE FIELD. AT 1000 AGL WE WERE IN THE DOWNWIND POS DIRECTLY ABEAM THE 'NUMBERS' WHERE WE WANTED TO BE FOR OUR LNDG PATTERN; AND WE WERE MAKING AN APPROPRIATE APCH INTO THE FIELD. AS THE INSTRUCTOR; I WAS GUIDING MY STUDENT AT THIS POINT; BUT HE WAS ACTUALLY FLYING THE PLANE. AS WE TURNED FINAL AND IT WAS OBVIOUS THAT HE WAS ABLE TO MAKE IT INTO THE FIELD; I PRAISED HIM AND ADVANCED THE THROTTLE TO INITIATE OUR CLB OUT OF THE AREA. THE ENG DID NOT ADVANCE TO FULL PWR; AND I JUDGED THAT WE DID NOT HAVE PWR TO CLB; SO I RETARDED THE THROTTLE; MADE A RAPID CHK OF THE POS OF OUR SWITCHES; AND MAINTAINED CTL OF THE PLANE AS WE CONTINUED TO DSND. AS WE DSNDED INTO THE FIELD WE HEARD THE SOUND OF A THIN PWR LINE STRIKING THE UNDERSIDE OF THE PLANE. IT SEEMED TO SLOW US DOWN A BIT; BUT WE STILL HAD AIRSPD TO MAKE A SAFE LNDG IN THE FIELD; AND ROLLED TO A STOP. AFTER WE WERE ON THE GND THE ENG WAS IDLING; AND WHEN I ADVANCED THE THROTTLE TO MOVE THE PLANE OVER TOWARDS THE NEAREST HOUSE IT RAN JUST FINE; AND I COULD NOT DUPLICATE THE STALLING. WE TAXIED AROUND THE FIELD TO EVALUATE IF IT WAS LONG AND SMOOTH ENOUGH TO DEPART AFTER INSPECTING THE AIRPLANE AND FINDING NO DAMAGE; BUT WE JUDGED THAT IT WAS TOO SHORT; SO WE WALKED TO THE FARM HOUSE AND CALLED MY SUPVR TO NOTIFY HIM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THERE WAS NO DAMAGE TO THE ACFT FROM THE WIRE. HE STILL HAS A PIECE OF IT COILED UP AS A SOUVENIR. THE ACFT RECEIVED NO DAMAGE WHATSOEVER AND WAS FLOWN OUT THE NEXT DAY. THERE WAS 30 KTS OF WIND THE NEXT DAY AND THEY FOUND THE LIGHTEST INSTRUCTOR ON THE STAFF TO MAKE THE FLT OUT. FAA IS DOING AN INVESTIGATION.