General aviation knowledgeBeginner

Emergency exits and evacuation principles

General principles behind aircraft exits and evacuations — not a substitute for type-specific training.

Commercial aircraft are certified to be evacuated within 90 seconds using only half of the available exits, with the rest assumed blocked — this drives exit spacing, slide design and crew training.

Crew are trained to assess each exit before opening it, since opening a door onto fire, water or an unstable surface can create new danger.

Evacuation commands are short, loud and repeated ('Release seatbelts, get out, leave everything!') because clarity saves seconds that matter.

Key points

  • Aircraft must be certifiably evacuable in 90 seconds using half the exits.
  • Crew assess exit conditions before opening them.
  • Evacuation commands are short and repeated for clarity.

Vocabulary

90-second rule
The certification requirement that an aircraft be evacuable in 90 seconds with half the exits usable.
Evacuation slide
An inflatable slide deployed at an exit to help passengers reach the ground quickly.

Remember this

Educational overview only — always follow the current airline/operator procedures and approved training.

Mini quiz

Question 1 of 1

Why do crew assess an exit before opening it?

Sources

Last verified: 2026-09-28