If the outer window is cracked or shattered, what is the first action to take?

When dealing with a cracked or shattered outer window in an aircraft, the primary concern is the safety of all personnel in the vicinity. The outer window serves as a crucial barrier against the outside environment, and if it is compromised, it can lead to rapid decompression or exposure to hazardous conditions depending on altitude and flight situation.

Evacuating the area ensures that no one is at risk from potential glass shards or further decompression. This immediate action prioritizes the safety of individuals first, before attempting to diagnose the issue or fix it.

While investigating the damage or addressing environmental stabilization, such as turning on the heat switch or donning oxygen, are important steps to take after ensuring the area is safe, the first response must always prioritize human safety.