At what altitude does the AFCS automatically select 1/2 bank?

• A. 31,600 ft
• B. 30,000 ft
• C. 32,000 ft
• D. 31,000 ft

Answer: (A)

The AFCS uses altitude-based bank protection to keep handling smooth and safe in the thin air of high cruise. Once you’re above a certain cruise altitude, the system automatically switches to a half-bank mode, which reduces the bank angle commanded by the autopilot. This gentler roll helps prevent large, hard turns, eases control authority demands in very thin air, and reduces structural loads while maintaining stable lateral guidance. The threshold for this automatic change is 31,600 ft, so that altitude is when the system switches to 1/2 bank.