What is the maximum temperature for takeoff and landing for the CRJ?

The maximum temperature for takeoff and landing of the CRJ is ISA +40°C, making the correct choice ISA +40°C. This temperature limitation is critical as it affects aircraft performance during these phases of flight, particularly in terms of engine efficiency, climb rate, and overall handling characteristics.

Operating above the specified temperatures can lead to reduced performance due to decreased air density, which directly impacts the lift generated by the wings and the thrust provided by the engines. Understanding these limits helps ensure safety and compliance with operational guidelines.

In this context, while SA +30°C and SA +35°C are both temperature thresholds, they do not meet the actual maximum limit for operations. On the other hand, ISA +45°C exceeds the acceptable operational parameters, potentially compromising safety due to the effects of high temperature on performance.