PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

At what fuel temperature is takeoff prohibited?

1. 0 Degrees C

2. 5 Degrees C

3. 10 Degrees C

4. 15 Degrees C

The correct answer is: 5 Degrees C

The prohibition of takeoff at specific fuel temperatures is crucial for the safe operation of aircraft systems, especially in the context of the Canadair Regional Jet. The correct answer, which specifies 5 degrees Celsius, is based on the potential for fuel icing, which can occur at lower temperatures. When fuel temperature falls below this threshold, there is a risk of fuel becoming excessively cold, potentially leading to the formation of ice crystals. These ice crystals can cause blockages in fuel lines, filters, and injectors, resulting in engine performance issues or failures. Therefore, taking off with fuel at or below this temperature helps ensure that the fuel remains within an operationally safe range, reducing the likelihood of ice formation and ensuring reliable fuel delivery to the engines. Maintaining fuel temperature above this limit is a precautionary measure that aligns with safety protocols and operational guidelines to mitigate risks related to fuel system performance during critical phases of flight.