What is the minimum fuel tank temperature limit for the ERJ 175?

What is the minimum fuel tank temperature limit for the ERJ 175?

• A. -37°C
• B. -30°C
• C. -45°C
• D. -25°C

Answer: (A)

The main idea is that fuel temperature limits protect the fuel system from issues caused by very cold fuel in the tanks and lines. Setting a minimum fuel tank temperature of -37°C creates a safe margin above Jet A’s freezing point (about -40°C), helping prevent ice formation, wax precipitation, or water-related blockages in pumps and filters. This margin also accounts for measurement tolerances and potential subcooling inside the tank or in transfer lines, ensuring the fuel remains reliably pumpable and the system operates as designed in cold weather. Choosing -37°C as the minimum keeps the fuel above the critical freezing region while not being so warm that it unnecessarily restricts operations. A limit of -30°C or -25°C would allow colder conditions to creep closer to the freezing point, increasing risk, and a limit like -45°C would be dangerously close to or below the fuel’s freezing point, which is not acceptable for safe operations.

The main idea is that fuel temperature limits protect the fuel system from issues caused by very cold fuel in the tanks and lines. Setting a minimum fuel tank temperature of -37°C creates a safe margin above Jet A’s freezing point (about -40°C), helping prevent ice formation, wax precipitation, or water-related blockages in pumps and filters. This margin also accounts for measurement tolerances and potential subcooling inside the tank or in transfer lines, ensuring the fuel remains reliably pumpable and the system operates as designed in cold weather.

Choosing -37°C as the minimum keeps the fuel above the critical freezing region while not being so warm that it unnecessarily restricts operations. A limit of -30°C or -25°C would allow colder conditions to creep closer to the freezing point, increasing risk, and a limit like -45°C would be dangerously close to or below the fuel’s freezing point, which is not acceptable for safe operations.