What should be done if the altitude indicator does not reflect altitude changes promptly during straight-and-level flight?

When the altitude indicator does not reflect altitude changes promptly during straight-and-level flight, the best course of action is to wait for the indicator to stabilize. The altitude indicator, being a sensitive instrument, may experience temporary lag in its readings due to various factors, including instrument error or sensor response time. Making excessive pitch changes or maintaining rapid control inputs could induce unnecessary turbulence in the flight path and lead to potential control issues, as these actions could further destabilize the aircraft and the instruments.

Performing a rapid descent, on the other hand, is an extreme maneuver that is not justified under these circumstances and could pose significant risks to safety. By allowing time for the altitude indicator to stabilize, the pilot can confidently ascertain altitude without introducing additional variables or risks into the flight. This approach promotes better situational awareness and helps maintain safe and controlled flight conditions.