Question id 478 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Prevent Overheating And Subsequent Creep Of The Nozzle Guide Vanes.
Prevent damage to the jet pipe from overheating.
Ensure that the maximum acceptable temperature within the combustion chamber is not exceeded.
Ensure that the maximum acceptable temperature at the turbine blades is not exceeded.