Question id 152 - Communication - SPL - Sailplane Pilot License

Sent by a pilot or an aircraft operating agency which have an imminent meaning for aircraft in flight
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
Concerning the operation or maintenance of facilities essential for the safety or regularity of aircraft operation

Training tests and timed exam simulations SPL - Sailplane Pilot License