If the yaw damper is inoperative, what is the implication?

When the yaw damper is inoperative, it has significant implications for the handling and control of the aircraft. The yaw damper is a system designed to help maintain the aircraft's directional stability. It works by automatically correcting any unwanted yaw movements, which can be caused by external disturbances like gusts of wind or asymmetrical engine thrust.

Without the yaw damper functioning, pilots must manually manage directional stability, which increases workload and can lead to difficulties in maintaining straight flight. This situation can make the aircraft more susceptible to yaw oscillations, which can adversely affect safety and control.

Thus, the correct choice indicates that there are indeed consequences when the yaw damper is not operating, leading to an increase in pilot workload and potential stability issues. The option stating "None of the above" correctly reflects that none of the other listed outcomes – increased fuel efficiency, improved control, or decreased drag – are relevant in this context. With an inoperative yaw damper, the expected operational challenges and reduced control demonstrate the critical nature of this system in ensuring safe and efficient flight operation.