What is the purpose of the roll disconnect T handle?

The roll disconnect T handle is specifically designed to address situations where there may be a malfunction or jam in the aileron control system. When this handle is activated, it effectively separates the control columns for the left and right side, allowing the pilot to isolate a faulty side and maintain control of the aircraft using the functioning side. This action can help in recovering from an unusual attitude or preventing further complications arising from a jammed aileron.

In contrast, while the other options mention distinct functions related to aircraft control and operation, they do not accurately describe the role of the roll disconnect T handle. The separation of control columns enables the pilot to manage roll control even if one side is compromised, reflecting the critical safety function served by this component in the aircraft's design.