the circuit 32 tests to see if the accumulated time is greater than or equal to 34 t 34 comparative step 62 if so the circuit 32 turns the motor 34 off 34 step 64 and returns to the beginning of the flow chart step 40 if the accumulated time has not reached 34 t 34 the circuit proceeds to step 50 if outside forces such as wind gusts complement the motor 30 in turning the turbine the turbine may spin at a speed greater than that which the motor 30 is turning in that case the coupler system 26 will slip allowing the turbine to rotate freely step 60 if the turbine speed exceeds 34 a 34 the circuit 32 will then test to see if the engine has been turned on by determining if the turbine speed exceeds 34 b 34 comparative step 66 if so the circuit 32 will then turn the motor 30 34 off 34 and proceed to the beginning of the flow chart if the speed is less than 34 b 34 i e the turbine has not been started the circuit 32 will test to see if the accumulated time is greater than or equal to 34 t 34 comparative step 62 if so the circuit 32 will turn the motor 30 off step 64 and proceed to the beginning of the flow chart if the accumulated time is less than 34 t 34 the circuit 32 proceeds to step 50 because the initial temperature from which the engine must be cooled is significantly higher than generally ambient temperatures the period 34 t 34 can remain constant regardless of whether the aircraft is in arctic or tropical conditions however the logic circuit 32 can be adjusted for local conditions should the end user.