Which instrument becomes a supporting pitch instrument in a steep turn?

In a steep turn, the primary pitch instrument that pilots rely on is the attitude indicator. The attitude indicator displays the aircraft's orientation relative to the horizon and provides crucial information about whether the wings are level or if the aircraft is climbing or descending.

During a steep turn, the aircraft experiences increased load factors, and maintaining the correct bank angle and pitch becomes essential. The attitude indicator helps the pilot manage pitch by ensuring that the aircraft remains level through the turn.

While the vertical speed indicator is a useful tool for visualizing the rate of climb or descent, it does not provide direct information about the aircraft's pitch attitude relative to the horizon in the same way that the attitude indicator does. Thus, in the context of a steep turn, the attitude indicator remains the primary pitch instrument, supporting the pilot's control of the aircraft's orientation during the maneuver.

The other instruments listed, like the heading indicator and airspeed indicator, serve different functions. The heading indicator indicates the direction the aircraft is pointing, while the airspeed indicator displays the speed of the aircraft. Neither of these instruments directly contributes to managing pitch attitude during a steep turn, making the attitude indicator the most relevant and supportive instrument in this scenario.