What occurs if the prop linkage fails in the T-54?

When the prop linkage fails in the T-54, the propeller’s system can become unregulated, potentially causing the propeller to advance to a higher RPM, such as 2000 RPM. This happens because the failure of the linkage means that the propeller cannot adjust its pitch correctly in response to the pilot's inputs. As a result, the propeller may not be able to enter a low-pitch or feathered position, leading to a situation where the engine maintains or even increases its RPM due to the lack of control.

Higher RPM can pose significant risks, including potential engine damage and loss of control, as the aircraft does not have a means to effectively manage the thrust produced by the propeller under these circumstances.