What is the status of takeoff with engine fuel temperature indications below +5°C?

The correct answer indicates that takeoff is prohibited if the engine fuel temperature indications are below +5°C. This limitation is in place because operating the engines with fuel at low temperatures can lead to issues such as fuel gelling or reduced fluidity, which can affect the performance and reliability of the engines during critical phases like takeoff. Cold fuel can fail to pump or atomize properly, potentially causing engine performance problems that could compromise flight safety.

Higher fuel temperatures improve the fuel's consistency and flow characteristics, ensuring that it reaches the engines optimally. Therefore, adhering to this limitation is crucial for safe operations. The other options, while they suggest varying degrees of permissiveness regarding takeoff with low fuel temperatures, do not align with safety protocols established for the CRJ 200. These protocols are designed to optimize engine performance and prevent situations that could lead to engine failure during a critical moment in flight.