At what speed does the high end of the white arc on the airspeed instrument fall?

The high end of the white arc on the airspeed instrument represents the maximum airspeed for operating with flaps extended, also known as VFE (Velocity Flaps Extended). For many aircraft, including general aviation models, this speed is typically associated with the lower limit of the green arc (normal operating range) and is crucial for safe operations during approach and landing phases, where flap deployment is common.

In this context, the value of 139 knots is consistent with the characteristics of various light aircraft, indicating the limit that should not be exceeded while the flaps are in the extended position. Exceeding this speed with the flaps extended could result in structural failure or reduced control effectiveness.

The other speed options, while potentially applicable in different contexts or for different aircraft types, do not correspond to the typical VFE for most aircraft. Understanding these specifics about airspeed limitations is essential for safe flight operations and helps pilots avoid exceeding safe operational parameters.