The time required from the arrival of the first fire-fighting vehicle to the time the initial intensity of the fire is reduced by 90 percent is called which type of time?

The time described in the question refers to the period required for the firefighting efforts to significantly diminish the fire's intensity, specifically by 90 percent. This phase is known as the control time because it focuses on the effectiveness of the firefighting response and indicates when the fire has reached a manageable state, minimizing risk to the aircraft, passengers, and environment.

Control time is a critical metric in firefighting as it reflects the efficiency and speed of the response team in bringing the situation under control. This timeframe can vary depending on various factors, including the type of firefighting equipment, the training of the personnel, and the characteristics of the fire itself.

In contrast, terms like discharge time refer to the overall duration for which water or foam is applied, extinguishment pertains to the complete elimination of the fire, and vulnerability does not directly relate to the timeline of firefighting operations. Understanding these distinctions helps highlight the importance of control time as a specific measure of firefighting effectiveness in airport scenarios.