What is ITT in Aviation? (Interstage Turbine Temperature)

In the world of aviation, there are countless terms and acronyms that may be unfamiliar to those outside the industry. One such term is “interstage turbine temperature,” commonly known as ITT. ITT is an important concept in aviation as it relates to the performance and reliability of aircraft engines. In this article, we will explore the meaning of interstage turbine temperature and its significance in aviation.

The Significance of Interstage Turbine Temperature

Interstage turbine temperature (ITT) refers to the temperature of the gases flowing between the high-pressure (HP) and low-pressure (LP) turbines in a turbine engine. It is a critical parameter that directly affects the engine’s performance, efficiency, and durability. ITT is measured in degrees Celsius (°C) and is typically monitored by a dedicated temperature gauge in the cockpit or displayed on the engine indication system.

The interstage turbine temperature has a significant impact on the overall performance of an aircraft engine. It affects the power output, fuel consumption, and the lifespan of the turbine components. Excessive ITT can lead to engine damage, reduced power, and increased fuel consumption, while insufficient ITT can result in lower efficiency and engine performance.

Monitoring and controlling the interstage turbine temperature is crucial for the safe and efficient operation of an aircraft. Maintaining the ITT within the recommended operating range ensures optimal engine performance and minimizes the risk of engine failures or malfunctions.

Factors Affecting Interstage Turbine Temperature

Several factors can influence the interstage turbine temperature in an aircraft engine. Let’s take a closer look at some of these factors:

1. Airflow and Combustion Efficiency

The amount and quality of the airflow and combustion efficiency play a crucial role in determining the interstage turbine temperature. The correct ratio of fuel to air is essential to achieve optimal combustion and prevent excessive ITT. Proper fuel-air mixture ensures complete combustion and reduces the likelihood of hot spots within the engine, which can lead to high ITT and engine damage.

Engine designers and manufacturers employ various techniques to promote efficient airflow and combustion, such as advanced compressor and turbine designs, fuel injection systems, and combustor designs. These technologies help maintain the desired ITT while optimizing engine performance.

2. Power Setting

The power setting of an aircraft engine also affects the interstage turbine temperature. Higher power settings, such as takeoff or maximum continuous power, produce more heat and increase ITT. Pilots must carefully manage engine power settings to ensure that the ITT remains within the safe operating range prescribed by the engine manufacturer.

During flight, pilots can adjust the power settings to optimize engine performance while keeping the ITT in check. This involves balancing the desired level of performance with the need to avoid overloading the engine and causing excessive ITT.

3. Cooling Systems

Aircraft engines are equipped with cooling systems to manage the interstage turbine temperature and prevent overheating. These cooling systems include air cooling, oil cooling, film cooling, and internal cooling passages within the turbine blades.

Air cooling systems supply cooler air to the turbine section, reducing the ITT. Oil cooling systems use engine oil to carry away excess heat, preventing thermal damage to the turbine components. Film cooling involves layering a thin film of cooler air over the surface of the turbine blades to shield them from the extreme heat.

The effectiveness of these cooling systems is critical for maintaining the ITT within the safe limits and ensuring the longevity of the engine. Regular maintenance and inspections of these systems are necessary to detect any potential issues and prevent overheating.


Interstage turbine temperature (ITT) is a vital parameter that plays a crucial role in the performance, efficiency, and durability of aircraft engines. Monitoring and controlling the ITT within the recommended operating range is essential for safe and efficient operation. Various factors, including airflow, combustion efficiency, power settings, and cooling systems, influence the ITT. By understanding and managing these factors, pilots and engineers can optimize engine performance while safeguarding against excessive ITT and potential engine failures.

Next time you hear the term “interstage turbine temperature,” you will have a better understanding of its significance and how it impacts the world of aviation.

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