TRUE/FALSE: Operating the HF radio in high power may result in disengagement of the AFCS yaw channel.

• A. True
• B. False
• C. Not affected
• D. Unknown

Answer: (A)

Electromagnetic interference from high-power HF transmissions can affect avionics, including the AFCS yaw channel. The AFCS yaw channel relies on clean signals from sensors and precise control signals to the tail rotor. When the HF radio operates at high power, the resulting RF energy can couple into avionics and power circuits, introducing noise or transients that degrade the yaw channel signals. The autopilot/AFCS is designed to disengage a channel when it detects abnormal input or degraded signal quality to maintain safe control. So, high-powerHF operation can cause the AFCS yaw channel to disengage, making this statement true. If needed, ensure proper shielding, separation, and appropriate power settings to minimize EMI effects.