What is the approximate ground roll when the temperature is 70 °F, pressure altitude is sea level, weight is 3,400 lb, and headwind is 16 kts?

To calculate the approximate ground roll for an aircraft under the given conditions, we consider factors such as temperature, pressure altitude, weight, and headwind. At a temperature of 70 °F with a pressure altitude of sea level, the air density is at a typical standard condition, which allows for optimal engine performance and lift generation.

The weight of 3,400 lb indicates a relatively light aircraft, and lighter aircraft generally have shorter takeoff distances because they require less lift to become airborne. The headwind of 16 knots is particularly beneficial because it reduces the takeoff roll distance. A headwind increases the effective airspeed over the wings at the moment of liftoff, allowing the aircraft to reach the necessary lift-off speed more quickly.

Given these conditions, the estimated ground roll can be calculated using established performance data or formulas specifically designed for various aircraft. Among the provided options, the calculated and predicted length of the ground roll—taking into account all these factors—matches approximately 676 feet. This figure reflects the benefit of the favorable conditions, particularly the headwind, in shortening the required ground roll for takeoff.

Choosing 676 feet as the approximate ground roll aligns with typical performance metrics of aircraft operating under these circumstances. This distance indicates a