In
the construction of a free power turbine engine the free turbine is located
after the turbine driving the gas generator. The gas generator turbine will be
subjected to higher temperatures than the free turbine and it is the
temperature limits of this turbine which need to considered.
Thermocouple systems are normally positioned just after the first stage turbine
rotor.
In a free turbine engine this would be between the gas generator turbine and
free turbine.