What is the maximum fuel temperature for tanks not feeding APU or engines?

• A. 62 °C
• B. 59 °C
• C. 57 °C
• D. 60 °C

Answer: (A)

Fuel temperature limits depend on whether the tank is feeding a system or not. When a tank is not supplying the APU or engines, it isn’t in the heat path of active fuel lines and pumps, so the limit is set higher. The maximum allowed temperature is 62 °C to keep the fuel within its specifications and prevent issues from excessive heat, while still guarding against temperatures that could degrade fuel properties or stress tank components.

If the tank were feeding an APU or engine, the limit would be tighter to protect the fuel system and combustion performance under active use. That’s why the value 62 °C is the appropriate maximum for tanks not feeding APU or engines.