Cessna 150
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 32; Flight Crew Total 4515; Flight Crew Type 87
Distraction; Training / Qualification; Workload
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition
Human Factors; Weather; Procedure
While flight instructing; training a licensed pilot in stalls; stall awareness; and stall recoveries; carburetor heat was not applied.  The outside air temperatures were sufficient enough to produce carburetor ice.  The engine lost power; and best glide was established.  Time allotted for three restart attempts; checking carburetor heat; fuel; mags; etc...  While gliding the plane successfully into a nice field; instructing a 'real time' engine out procedure; and calling out restart checks; the carburetor heat did not clear the ice. A successful soft field landing was executed with no incident. This was a checkout/currency flight; wanting to review all phases of flight for eventual solo.  While intensely instructing; and calling out entry and recovery procedures; I failed to verify carburetor heat was indeed on.    In unusual attitudes; and stall recovery training; a more thorough briefing on the importance in the use of applying carburetor heat should have been reviewed.  In longer reductions of power; such as in stall series training; especially in dew point temperature ranges that are conducive to carburetor icing; training the use of carburetor heat should be stressed by all flight instructors and pilots alike.The aircraft was flown back from the location of the forced landing with no incident.
A C150 Instructor conducting a checkout with a licensed pilot failed to select carburetor heat during stall training which resulted in the engine quitting. A successful off airport landing followed unsuccessful inflight start attempts.