When departing KNSE, what action should be taken if you reach the altitude of 4200' MSL before ATC gives further instruction?

Continuing to climb after reaching an altitude of 4200' MSL before receiving further instruction from ATC is the correct action because it ensures compliance with standard operating procedures and maintains separation from other aircraft. When departing from an airport, especially in controlled airspace, it is essential to remain at or above the minimum safe altitude until ATC provides additional instructions for your flight path.

Continuing to climb keeps you within the designated airspace management protocols, allowing ATC to maintain orderly traffic flow. Additionally, staying in communication with air traffic control while following their initial clearance is vital. If you were to take other actions, such as turning left or right or flying straight without continuing to the assigned altitude, this could potentially lead to conflicts with other aircraft or violate flight safety procedures, particularly in high-traffic areas. By continuing to climb, you allow ATC the necessary time to assess the airspace and give you the next set of instructions based on current conditions.