What is the transient engine oil temperature limit?

• A. 120 °C for 5 minutes
• B. 125 °C for 5 minutes
• C. 127 °C for 5 minutes
• D. 130 °C for 5 minutes

Answer: (C)

The transient engine oil temperature limit for the TH-73A is established at 127 °C for a duration of 5 minutes. This limit is designed to ensure that the engine can operate safely within specified thermal parameters during brief periods of elevated oil temperature, typically associated with certain maneuvers or power settings that may cause a temporary spike in temperature.

Exceeding this temperature for longer durations or operating consistently near or above this limit could lead to accelerated wear or damage to the engine components due to inadequate lubrication or thermal stress. Therefore, the transient limit is deliberately set to allow pilots a margin of operation while maintaining engine integrity and performance.

Understanding and adhering to these temperature limits is essential for safe flight operations, ensuring that pilots can effectively manage engine performance while avoiding conditions that could jeopardize aircraft safety.