The AFCS automatically selects 1/2 bank at what altitude?

• A. 31,600 ft
• B. 28,000 ft
• C. 32,000 ft
• D. 29,500 ft

Answer: (A)

At very high altitude, air is thin and the airplane’s roll response slows, so the autopilot limits how aggressively it rolls to keep turns smooth and within the flight envelope. To achieve that stability, the AFCS is designed to reduce the bank angle commanded to a smaller value once you reach the upper altitude range. In this system, the half-bank mode is engaged at that high-altitude point, so the autopilot constrains turns to about half of the normal bank limit. That’s why the correct setting is reached only in the upper cruise regime, and turns below that altitude use the standard bank limits.