A SIMULATED ENG FAILURE ON A TRAINING FLT IN A C150 TURNS INTO THE REAL THING; ENDING IN A MARSH WITH THE ACFT ON ITS BACK.

Narrative

I WAS ON A ROUTINE TRAINING FLT WITH A STUDENT. ON OUR WAY BACK TO THE ARPT; I PULLED THE THROTTLE TO IDLE TO SIMULATE AN ENG FAILURE AT AN ALT OF 2000 FT MSL. THE STUDENT PROPERLY SET UP FOR A FORCED LNDG WHILE COMPLETING HIS EMER CHKLISTS. AT 700 FT; I TOLD HIM TO ADD PWR BUT NOTHING HAPPENED. I IMMEDIATELY TOOK CTL OF THE AIRPLANE AND TRIED PULLING THE THROTTLE BACK OUT AND PUSHING IT IN SLOWLY BUT; BUT THE ENG DID NOT RESPOND. I TOLD MY STUDENT TO CRANK THE IGNITION; BUT THAT DIDN'T WORK EITHER; SO I BEGAN SHUTTING EVERYTHING OFF FOR A FORCED LNDG IN A MARSH. I TOUCHED DOWN ON THE MAIN WHEELS FIRST AND TRIED TO HOLD THE NOSE UP AS LONG AS POSSIBLE. AFTER THE NOSEWHEEL HIT; IT BOGGED DOWN IN THE MUD AND WE FLIPPED OVER. WE QUICKLY GOT OUT OF THE AIRPLANE AND WERE NOT INJURED IN ANY WAY. PRIOR TO THE ENG FAILURE; THE ENG HAD BEEN OPERATING NORMALLY WITH THE OIL PRESSURE AND OIL TEMP GAUGES BOTH IN THE GREEN ARCS. PRIOR TO TAKING OFF; WE HAD FULL FUEL AND ADEQUATE OIL; AND I VERIFIED THAT THE FUEL CAPS AND OIL DIPSTICK WERE SECURE.