What is EGT in Aviation? (Exhaust Gas Temperature)

Exhaust Gas Temperature (EGT) in aviation refers to the temperature of the hot gases expelled from an aircraft’s engine after the combustion process. It is an important parameter that pilots and aircraft mechanics monitor closely during flight and maintenance, as it provides valuable information about the engine’s performance, efficiency, and potential issues. EGT is measured in degrees Fahrenheit (°F) or degrees Celsius (°C), depending on the region and the aircraft’s specifications.

EGT is a crucial metric for monitoring the engine’s health and optimizing performance. By analyzing the temperature of the exhaust gases, pilots and technicians can identify abnormal conditions, such as overheating or inefficient fuel combustion. Monitoring EGT allows them to make real-time adjustments to ensure the engine operates within a safe and efficient range.

When it comes to EGT, it’s essential to understand the difference between exhaust gas temperature and cylinder head temperature (CHT). While EGT measures the temperature of the hot gases leaving the engine, CHT measures the temperature at the cylinder head, providing insights into the combustion process within the engine. Both parameters are crucial for engine monitoring, but they serve different purposes.

Monitoring Exhaust Gas Temperature in Aviation

Monitoring EGT is a vital part of aircraft operation and maintenance. It helps ensure efficient engine performance and provides early warning signs of potential issues. An aircraft’s EGT is typically monitored through an exhaust gas temperature gauge or an electronic engine monitoring system.

The primary method of measuring EGT is through the use of thermocouples. Thermocouples are temperature sensors that generate an electrical voltage proportional to the temperature difference between their junctions. These sensors are strategically placed in the exhaust system to measure the temperature of the gases as they exit the engine.

Modern aircraft often utilize digital engine monitoring systems (EMS) that provide real-time EGT readings. These systems collect and analyze data from various engine sensors, including EGT, CHT, oil temperature, and pressure sensors. The information is then displayed to the pilot and can be logged for later analysis by maintenance crews. EMS offers a more comprehensive and accurate monitoring solution compared to traditional analog gauges.

Pilots closely monitor the EGT during different flight phases and maneuvers. During the climb phase, for example, monitoring the EGT helps ensure that the engine is operating within optimal temperature ranges and prevents overheating. In cruise flight, maintaining a stable EGT is essential for fuel efficiency and engine longevity. Lastly, during descent and landing, monitoring EGT can help detect abnormal temperatures that may indicate a potential issue with the engine.

It’s worth noting that different aircraft engines have specific EGT operating limits, which can vary based on factors such as altitude, power settings, and ambient conditions. Pilots and technicians must adhere to these limits to prevent engine damage and ensure safe operation. The aircraft’s manufacturer provides these limits in the Aircraft Flight Manual (AFM) or the Pilot’s Operating Handbook (POH).

Why is Exhaust Gas Temperature Important in Aviation?

Exhaust gas temperature plays a crucial role in aviation for several reasons:

1. Engine Performance: Monitoring the EGT helps pilots ensure that the engine is operating within the optimal temperature range for maximum performance. Running the engine too hot can cause wear and damage, while running it too cold can lead to incomplete fuel combustion and reduced power output.

2. Fuel Efficiency: Maintaining a stable EGT is essential for fuel efficiency. By monitoring the exhaust gas temperature, pilots can fine-tune the engine’s fuel-to-air ratio, ensuring that fuel is utilized efficiently without excessive wastage.

3. Engine Health: Monitoring the EGT provides insights into the engine’s overall health and identifies potential issues. Abnormal EGT readings can indicate problems such as fuel leakage, faulty injectors, or cooling system malfunctions. Detecting these issues early on can prevent further damage and ensure safe operation.

4. Preventing Engine Damage: Excessive exhaust gas temperature can lead to engine damage, such as overheating, piston ring failure, or turbine blade degradation. By closely monitoring the EGT, pilots and technicians can take timely actions to prevent such damages, including reducing power, adjusting the fuel mixture, or conducting maintenance procedures.

5. Safety: Monitoring EGT contributes to the overall safety of the aircraft and its occupants. Abnormal EGT readings can be an early indicator of potential engine failures or malfunctions. By promptly addressing these issues, pilots can avoid critical situations and ensure a safe flight.

Overall, monitoring the exhaust gas temperature in aviation is essential for optimizing engine performance, ensuring fuel efficiency, maintaining engine health, preventing damage, and ensuring the safety of the aircraft and its occupants.


Exhaust Gas Temperature (EGT) in aviation is a critical parameter that pilots and technicians monitor closely. It provides valuable insights into the engine’s performance, efficiency, and potential issues. By analyzing EGT readings, pilots can optimize engine performance, ensure fuel efficiency, detect anomalies, and prevent engine damage. Monitoring the exhaust gas temperature contributes to the overall safety and reliability of the aircraft. Therefore, understanding and appropriately managing EGT is crucial for anyone involved in aviation.

External Links

For more information about exhaust gas temperature in aviation, you can visit the following link:

Flight Mechanic – Exhaust Gas Temperature (EGT)

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