Which flight controls does the right yoke operate when the pitch disconnect handle is engaged?

When the pitch disconnect handle is engaged, the operation of the flight controls is affected by the configuration of the control surfaces linked to the pilot's yoke. In this scenario, the right yoke is specifically designed to operate the right elevator when the pitch disconnect handle has been activated. This function allows the pilot to maintain control over the aircraft's pitch primarily through the right elevator, which is responsible for controlling the aircraft's altitude and angle of ascent or descent.

The rationale behind this design is to ensure that even in cases where there are malfunctions or changes in the control system, the pilot retains some level of control over critical flight parameters. In this instance, focusing on the right elevator isolates pitch control to the right side, allowing for smoother handling and response from that surface despite any disconnects that may affect other controls.

The other control options are not directly affected by the operation of the right yoke in this specific scenario. The right aileron, vertical stabilizer, and left spoiler engage with different aspects of aircraft maneuverability and stability; hence, they do not operate through the right yoke when the pitch disconnect is engaged.