Final answer:
The speed at which flaps begin to auto-schedule during takeoff with FLAP switch in HALF is specific to the aircraft model and its flap control system, and without further details, it's not possible to provide an exact figure.
Step-by-step explanation:
The question relates to an aspect of aeronautical engineering concerning the operation of aircraft systems during takeoff. Specifically, it deals with the characteristic behavior of the flaps on an airplane when set to a HALF position and the auto scheduling of flap movement as the aircraft accelerates. The speed at which the flaps begin to auto-schedule during takeoff will vary depending on the aircraft model and its specific flap control system. Most commercial aircraft have predefined speeds that pilots are trained to know or are prompted by the airplane's automation systems.
For example, in some Boeing aircraft, whether the flaps start auto-scheduling at a particular speed may depend on the aircraft configuration and the input from various sensors related to airspeed, altitude, and aircraft performance requirements. However, without specific details of the aircraft model or the context in which the system operates, it is challenging to provide an exact answer to this question.