Definition
A cockpit instrument that displays the temperature of the exhaust gases entering the first stage of the turbine in a turbine engine, or the temperature at the turbocharger turbine inlet in a turbocharged piston engine. It allows the pilot to monitor and avoid exceeding the engine's maximum allowable internal temperature limit.
Plain English
A gauge that shows how hot the gases are as they hit the turbine. The pilot watches it to make sure the engine isn't running too hot.
Context Anchor
Seen on turbine engine instrument panels and in heat management discussions, especially during engine start, takeoff, climb, and other high-power operation.
Derivation
Turbine comes from the Latin turbo, meaning a spinning thing or whirlwind. Inlet means the point where something enters. Together the term points to the temperature right where hot gases enter the spinning turbine wheel — the part of the engine most vulnerable to heat damage.
Why Pilots Care
Excessive temperature here can damage turbine blades and shorten engine life, so pilots use the gauge to manage power and prevent overheating.
Grounding Statement
When power is increased, the turbine inlet temperature usually rises, so the gauge gives the pilot a direct warning before heat becomes excessive.
Intuition Check
Do not read this as a general engine temperature gauge. It is not showing outside air temperature, oil temperature, or cabin heat; it is showing the hot gas temperature entering the turbine section.
Example Sentence 1
During the climb, the pilot leveled off briefly to let the turbine inlet temperature gauge settle back within limits before continuing to altitude.
Example Sentence 2
A rising indication on the turbine inlet temperature gauge caused the pilot to reduce power smoothly.