AFCS heading hold operates only below what KIAS with a rate of turn less than how many degrees per second?

AFCS heading hold operates only below what KIAS with a rate of turn less than how many degrees per second?

• A. 40, 2
• B. 40, 4
• C. 50, 2
• D. 50, 4

Answer: (A)

Heading hold in the AFCS is designed for calm, slow flight. It will only operate when you’re below 40 knots indicated airspeed and your rate of turn is less than 2 degrees per second. Beyond those limits, the system isn’t intended to hold heading because attempting to do so at higher speeds or during faster turns can cause unstable yaw behavior, overshoot, or unnecessary control inputs due to rotor dynamics and aerodynamic coupling. So the safest and most reliable envelope for this mode is under 40 KIAS with a very gentle turn (less than 2 deg/sec). If you exceed those limits, heading hold won’t engage or will disengage, and you’d fly heading manually or switch to another AFCS mode.

Heading hold in the AFCS is designed for calm, slow flight. It will only operate when you’re below 40 knots indicated airspeed and your rate of turn is less than 2 degrees per second. Beyond those limits, the system isn’t intended to hold heading because attempting to do so at higher speeds or during faster turns can cause unstable yaw behavior, overshoot, or unnecessary control inputs due to rotor dynamics and aerodynamic coupling. So the safest and most reliable envelope for this mode is under 40 KIAS with a very gentle turn (less than 2 deg/sec). If you exceed those limits, heading hold won’t engage or will disengage, and you’d fly heading manually or switch to another AFCS mode.