What temperature range comes into play when calculating TAS at lower altitudes?

The correct answer indicates that when calculating True Airspeed (TAS) at lower altitudes, a temperature range of -30 to -45 degrees Celsius is considered. This range is relevant because as altitude increases, the temperature generally drops, and this can significantly affect air density and the performance of the aircraft.

At lower altitudes, particularly in colder regions or seasons, temperatures can fall within this specified range, impacting the dynamic pressure experienced by the aircraft. When the aircraft is operating in these conditions, it is essential to account for temperature variations to accurately calculate TAS, which is the speed of the aircraft relative to the air through which it is moving.

Understanding this temperature boundary helps pilots and dispatchers to make appropriate adjustments and considerations for fuel efficiency, operational performance, and overall safety when flying in these colder environments. The ranges represented in the other choices do not accurately reflect the conditions typically encountered at lower altitudes in colder climates, leading to potential miscalculations in TAS.