Definition 1 of 2
Definition
The temperature of the gases entering the turbine section of a gas turbine engine, measured immediately after the combustion section and before the first stage of turbine blades. It is the hottest point in the engine's gas path and is a critical limiting parameter for engine operation, since exceeding it can damage or destroy the turbine blades.
Plain English
How hot the gases are just as they hit the spinning blades inside a jet engine. This is the hottest spot in the engine, and going over the limit can wreck the blades.
Context Anchor
Seen on turbine-engine instruments and engine operating limits, especially during engine start, takeoff, climb, and high-power operation.
Derivation
Turbine comes from the Latin word turbo, meaning a spinning top or whirlwind. That fits because a turbine is a wheel-like engine part that spins when fast-moving gas flows through it. Inlet means the place where something enters, so Turbine Inlet Temperature is the temperature at the entrance to the turbine.
Why Pilots Care
Exceeding the engine’s TIT limit quickly damages turbine blades and can force an engine shutdown or overhaul.
Grounding Statement
Picture very hot gas leaving the burning part of the engine and reaching the first spinning turbine blades; Turbine Inlet Temperature is the heat level at that point.
Intuition Check
Turbine Inlet Temperature is not outside air temperature, and it is not the temperature of exhaust after it leaves the engine. It is the gas temperature inside the engine right before the turbine blades.
Example Sentence 1
During engine start, the pilot watched the turbine inlet temperature closely to make sure it stayed below the start limit.
Example Sentence 2
After landing, the mechanic checked the recorded turbine inlet temperature peaks to see whether any exceedances had occurred.