What initial action should a pilot take to establish a climb from 190 knots to 160 knots?

To establish a climb from 190 knots to 160 knots, the pilot's initial action should be to adjust the elevator for the climb pitch. This adjustment alters the aircraft's angle of attack and helps to establish the necessary climb attitude. When an aircraft is flying at a higher speed, such as 190 knots, the pilot will need to pitch up to achieve a climb at a lower speed such as 160 knots, while maintaining optimal performance and control over the aircraft's lift.

Pitching up appropriately allows the airplane to increase its altitude while simultaneously reducing its speed to the desired level. This is critical for ensuring safety and efficiency in the climb phase, as exceeding the aircraft's maximum operating speed during the climb could result in adverse aerodynamic effects, whereas maintaining an appropriate climb pitch ensures a smooth transition to the desired speed.

Adjusting power and other factors, while important, becomes secondary actions following the initial adjustment of the elevator for the climb pitch.