How quickly must an evacuation be executed?

How quickly must an evacuation be executed?

• A. 60 seconds
• B. 90 seconds
• C. 120 seconds
• D. 180 seconds

Answer: (B)

Evacuation time is the maximum moment from the alarm to everyone being clear of the aircraft in an emergency. The standard target is 90 seconds, because it’s fast enough to beat deteriorating cabin conditions like smoke and heat, yet realistic to achieve with proper crew guidance and the use of all available exits. It accounts for human reaction time, moving through aisles, and slide or door operations, making it a reliable benchmark in drills and certification. Pushing for a shorter time would require near-perfect behavior and equipment performance, which isn’t dependable in real life, while longer times would leave passengers exposed to hazards for too long. So 90 seconds best balances safety and practicality.

Evacuation time is the maximum moment from the alarm to everyone being clear of the aircraft in an emergency. The standard target is 90 seconds, because it’s fast enough to beat deteriorating cabin conditions like smoke and heat, yet realistic to achieve with proper crew guidance and the use of all available exits. It accounts for human reaction time, moving through aisles, and slide or door operations, making it a reliable benchmark in drills and certification. Pushing for a shorter time would require near-perfect behavior and equipment performance, which isn’t dependable in real life, while longer times would leave passengers exposed to hazards for too long. So 90 seconds best balances safety and practicality.