What is the minimum ambient temperature for takeoff or landing for the CRJ 900?

The minimum ambient temperature for takeoff or landing for the CRJ 900 is indeed -40°C. This limitation is crucial for ensuring safe operations, as temperatures below this threshold can lead to various performance issues, such as decreased engine efficiency and reduced lift. Additionally, colder temperatures can affect the aircraft's systems, including the systems that manage ice and fuel, thereby presenting challenges during critical phases of flight. It's essential for flight crews to adhere to these temperature limitations to maintain operational safety and performance integrity of the CRJ 900.