Upon TOGA activation, which lateral mode is initially engaged and which nav source is armed?

• A. Lateral mode ROL is activated and NAV mode is armed; Nav sources switch back to FMS if not there already.
• B. Lateral mode HDG is activated and NAV mode is armed; Nav sources switch to VOR.
• C. Lateral mode NAV is activated and ROL is armed; Nav sources switch to GPS.
• D. Lateral mode LNAV is activated and NAV mode remains off; Nav sources stay as is.

Answer: (A)

When TOGA is pressed, the automatic go-around logic starts by establishing a quick, controlled roll to initiate the climb. That means the lateral mode engaged is a roll mode (ROL), rather than holding a heading or tracking a specific nav signal right away. At the same time, the system arms NAV mode so that once a valid navigation track is available, the autopilot can begin tracking lateral guidance. The navigation source is then switched back to the Flight Management System (FMS) if it isn’t already, so the autopilot uses the programmed flight plan or missed‑approach route for lateral guidance. This combination provides a safe, predictable go-around path that follows the intended route.