At what temperature does takeoff or landing become restricted due to excessive heat conditions?

The correct answer is based on the limitations established for aircraft operations related to temperature. For the CRJ 900 aircraft, takeoff or landing becomes restricted when the temperature reaches ISA +35°C. At this temperature, performance limitations may impact the aircraft's ability to safely operate, including increased takeoff distances, reduced climb rates, and other factors that compromise safety.

Exceeding this temperature can affect engine performance, aerodynamic efficiency, and overall aircraft handling characteristics, making it crucial for flight crews to adhere to these limits to ensure safe operation.

In aviation operations, specific temperature thresholds are established in the aircraft's operating manual to mitigate risks associated with high temperatures. Adhering to these limitations is vital, as exceeding them can lead to operational challenges that may compromise safety during critical phases of flight such as takeoff and landing.