What is the maximum power setting in high areas for ET (III)?

The maximum power setting in high areas for ET (III) is correctly identified as 85%. This setting is designed to optimize performance while accounting for the lower air density typically found at higher altitudes. In such conditions, the aircraft's engines may not produce power as efficiently due to the thinner air, which is why pilot training emphasizes this particular setting.

Setting the power to 85% ensures that there is an adequate safety margin while allowing for effective climb and maneuverability. This is particularly important during formation flying, where precision and control are paramount. The choice of power setting at high elevations reflects a balance between maximizing engine performance and ensuring that the aircraft behaves predictably, allowing pilots to handle formations safely and effectively.