The fuel system is designed to operate between sea level and how many feet, with a temperature range from -40 °C to what °C?

• A. 45000 feet / 50 °C
• B. 40000 feet / 0 °C
• C. 35000 feet / 25 °C
• D. 50000 feet / 60 °C

Answer: (A)

The question targets the operating envelope of the fuel system—the altitude and the fuel-temperature range it must handle. This system is specified to function from sea level up to 45,000 feet, and across fuel temperatures from -40 °C to +50 °C. The 45,000-foot ceiling reflects the pump, plumbing, and pressure/pump-head requirements across the jet’s typical flight envelope, where decreasing air density and changing pressures could challenge delivery but must still meet performance needs. The -40 °C lower limit ensures the system remains operable in very cold fuel conditions, while +50 °C upper limit protects components from overheating in hot-day scenarios and during engine/auxiliary operations. The other options would either cap altitude too low or set an upper temperature limit that’s outside the design, which is why the specified combination is the correct envelope.