If a flight attendant notices something wrong with the cabin door seal, what is their immediate action?

When a flight attendant notices something wrong with the cabin door seal, the most appropriate immediate action is to contact the captain. This is crucial because the captain is responsible for the flight's safety and makes decisions regarding the aircraft's operational integrity. Any issues related to the cabin door could affect cabin pressure and passenger safety, so it's imperative that the captain is informed to assess the situation and determine the necessary response, which could include returning to the gate, performing further checks, or notifying ground services.

While securing the cabin may be part of an overarching safety protocol, and visual inspections and evacuations are significant in their contexts, these actions are typically secondary to informing the captain in scenarios that could have safety implications. By prioritizing communication with the captain, the flight attendant ensures that the chain of command is followed and that a plan can be executed to address the issue appropriately.