Final answer:
EGT limits are the maximum allowable temperatures for engine gases. On the ground, the limit is lower due to reduced airflow, while in-flight, it is higher because of increased airflow.
Step-by-step explanation:
Engine EGT Limits:
The acronym EGT refers to Engine Gas Temperature, which is the maximum allowable temperature of the gases produced by an engine.
The EGT limits may vary depending on whether the engine is on the ground or in flight.
The ground EGT limit is usually lower than the in-flight EGT limit because the airflow around the engine is reduced when it is on the ground.
This reduction in airflow can cause the engine to overheat if the gas temperature exceeds the ground EGT limit.
In-flight, the engine benefits from increased airflow, allowing it to operate at a higher gas temperature without overheating.
For example, let's say the ground EGT limit is 244°C and the in-flight EGT limit is 477°C.
This means that the engine should not surpass 244°C when on the ground, as exceeding this limit can lead to overheating.
However, when the engine is in flight and benefiting from increased airflow, it can operate at temperatures up to 477°C without causing damage or overheating.