At what minimum temperature must the fuel be to ensure safe operation in the left main tank?

The correct answer is based on the fuel temperature limitations defined for the ERJ 170/175. The minimum temperature for safe operation of the fuel in the left main tank, which is crucial for maintaining proper fuel viscosity and ensuring that fuel systems operate efficiently without issues such as fuel freeze or clogging, is set at -37 degrees Celsius. This threshold is established to mitigate risks associated with colder temperatures, which could adversely affect fuel flow and engine performance.

Understanding this limitation is essential for flight operations, particularly in regions where temperatures may drop significantly. The specified limit ensures that pilots are aware of the operational boundaries regarding fuel temperatures, thus enhancing safety and reliability during flights.