What should be done if a crew member notices bleeding on a passenger?

Using compresses from the first aid kit is the most appropriate immediate action when a crew member notices bleeding on a passenger. This action is critical as it helps to control the bleeding and provides support until further medical assistance can be procured or the situation can be assessed more thoroughly. Compresses can be applied directly to the wound and are effective in stemming blood flow, especially when tight pressure is applied.

In a medical emergency involving bleeding, timely intervention is crucial. Applying a tourniquet might be necessary in cases of severe limb bleeding where arterial blood loss is evident; however, this is generally a more advanced procedure and should be reserved for life-threatening situations where bleeding cannot be controlled by other means.

Notifying the pilot is also important, but it should not be the sole action taken when a person is actively bleeding. The immediate priority should focus on stabilizing the affected individual. Waiting for further instructions without taking initial action could delay necessary care, which might worsen the passenger's condition.

In summary, using compresses from the first aid kit is a critical first step in managing bleeding, allowing for immediate response while ensuring that the situation is managed appropriately until additional help can be provided or further instructions are given.