Domanda 23, Communication - PPL(A) English - Private Pilot License (Aircraft)

Concerning the safety of an aircraft, a watercraft or some other vehicle or person in sight.
Concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance.
Sent by an aircraft operating agency or an aircraft of immediate concern to an aircraft in flight
Concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation