During an ILS/localizer approach, which autopilot mode combination provides lateral guidance via NAV/LNAV and speed management via A/THR?

• A. APPR with NAV/LNAV and A/THR
• B. AP with HDG and ALT
• C. NAV with ALT
• D. ALT with APPR

Answer: (A)

On an ILS/localizer approach you want the airplane to follow the localizer path while also controlling speed automatically. Engaging the approach mode primes the autopilot to intercept and fly the instrument approach. Using NAV/LNAV for the lateral side ties the autopilot to the localizer signal, so the aircraft tracks the LOC rather than holding a heading or altitude. Auto Thrust then manages airspeed, maintaining the chosen approach speed automatically. This combination gives precise lateral guidance along the localizer and consistent speed control, which is essential for a stable approach. The other options either rely on heading or altitude instead of following the LOC, or do not provide automatic speed management, making them less suitable for a proper ILS/localizer approach.