If the buttons on a PFD stop working, how can you control the functions on the screen?

• A. Push the PFD button on the opposite controller
• B. Use the MFD touchscreen
• C. Reboot the avionics bus
• D. Use the control wheel on the pilot’s seat

Answer: (A)

Redundancy in the cockpit lets you regain PFD control by switching to the other side. If the PFD bezel buttons on your side stop working, press the PFD button on the opposite controller. That action routes the PFD control to the other display’s control unit, so you can still interact with the PFD functions from the opposite side.

The MFD touchscreen controls the MFD, not the PFD, so it won’t restore control of the PFD. Rebooting the avionics bus is outside the normal quick-access control and isn’t the immediate way to regain manual control. The control wheel is used for flight controls, not for navigating PFD menu functions.