During what scenario would a firefighter use the Mayday callout?

A Mayday callout is specifically used when a firefighter is in immediate danger and requires urgent assistance. This type of distress signal is a critical tool in situations where a firefighter may be trapped, injured, or otherwise in a life-threatening scenario. The Mayday call alerts all personnel on the scene to the dire circumstances of the individual in distress and prompts a rapid and coordinated response to provide help.

In contrast, options involving scheduled equipment checks, routine check-ins, or non-emergency calls do not involve life-threatening situations and therefore would not warrant a Mayday call. Those situations are more about standard operational procedures and communication that do not require the immediate and urgent attention that a Mayday signal implies.