How do you modify the route in the MCDU during flight to accommodate ATC changes?

How do you modify the route in the MCDU during flight to accommodate ATC changes?

• A. Use the F-PLN page to insert or modify waypoints; recalculate fuel and performance; re-activate LNAV.
• B. Turn off navigation and fly by sight.
• C. Ask ATC to re-route verbally and wait.
• D. Power off the MCDU and re-enter.

Answer: (A)

When ATC changes the route, update the flight plan in the MCDU using the F-PLN page. You insert or modify the necessary waypoints to match the new clearance, then have the system recalculate fuel and performance for the updated route. After that, re-activate LNAV so the autopilot follows the modified path. This keeps the navigation, performance data, and aircraft guidance all in sync with ATC’s clearance. Notes: turning off navigation or flying visually bypasses the FMS, asking ATC and waiting delays the update, and powering off the MCDU isn’t a valid way to implement the change.

When ATC changes the route, update the flight plan in the MCDU using the F-PLN page. You insert or modify the necessary waypoints to match the new clearance, then have the system recalculate fuel and performance for the updated route. After that, re-activate LNAV so the autopilot follows the modified path. This keeps the navigation, performance data, and aircraft guidance all in sync with ATC’s clearance.

Notes: turning off navigation or flying visually bypasses the FMS, asking ATC and waiting delays the update, and powering off the MCDU isn’t a valid way to implement the change.