Why is the engine temperature monitored carefully when climbing?

Monitoring engine temperature during a climb is crucial because using high power at relatively low speeds can lead to an increase in engine temperature. When an aircraft climbs, it maintains a high power setting to overcome gravity and access higher altitudes. However, at lower speeds, the airflow over the engine may not be sufficient to dissipate heat effectively. This combination can result in the engine temperature rising, potentially indicating that the cooling system is struggling to keep the engine within optimal operating limits.

If left unchecked, elevated engine temperatures can lead to overheating, which can potentially cause engine damage or failure. Therefore, pilots must closely monitor engine temperatures during ascent to ensure that they remain within safe thresholds.