Question id 151 - Communication - SPL - Sailplane Pilot License

Concerning the safety of an aircraft, a watercraft or some other vehicle or person in sight
Concerning the operation or maintenance of facilities which are important for the safety and regularity of flight operations
Concerning aircraft and their passengers which face a grave and imminent threat and require immediate assistance
Sent by a pilot or an aircraft operating agency which have an imminent meaning for aircraft in flight

Training tests and timed exam simulations SPL - Sailplane Pilot License