The thermocouples on each engine are used to measure what parameter displayed on the FLI?

The thermocouples on each engine are used to measure what parameter displayed on the FLI?

• A. TOT
• B. N1
• C. N2
• D. RPM

Answer: (A)

Thermocouples are temperature sensors, and in a gas turbine engine they’re placed to monitor the exhaust gas temperature, which is the turbine outlet temperature. The value these sensors feed into the display is the turbine outlet temperature, abbreviated TOT. This parameter is used to judge how hot the turbine is running and to help control fuel flow to protect the engine. N1 and N2 are speeds of different engine sections, and RPM is a general rotational speed—those are measured by other sensors, not by thermocouples. So the parameter shown on the FLI from the thermocouples is TOT.

Thermocouples are temperature sensors, and in a gas turbine engine they’re placed to monitor the exhaust gas temperature, which is the turbine outlet temperature. The value these sensors feed into the display is the turbine outlet temperature, abbreviated TOT. This parameter is used to judge how hot the turbine is running and to help control fuel flow to protect the engine. N1 and N2 are speeds of different engine sections, and RPM is a general rotational speed—those are measured by other sensors, not by thermocouples. So the parameter shown on the FLI from the thermocouples is TOT.