If the station addressed does not respond, or if time or the situation dictates, the distress or urgency message may be broadcast, or a collect call may be used, addressing “Any Station (Tower)(Radio)(Radar).” If the pilot is not communicating and receiving services, the station to be called will normally be the air traffic facility or other agency in whose area of responsibility the aircraft is operating, on the appropriate assigned frequency. Normally, the station addressed will be the air traffic facility or other agency providing air traffic services, on the frequency in use at the time. Urgency communications have priority over all other communications except distress, and the word PAN-PAN warns other stations not to interfere with urgency transmissions. Distress communications have absolute priority over all other communications, and the word MAYDAY commands radio silence on the frequency in use.The signal PAN-PAN should be used in the same manner for an urgency condition. The initial communication, and if considered necessary, any subsequent transmissions by an aircraft in distress should begin with the signal MAYDAY, preferably repeated three times. Distress and urgency communications procedures discussed in the following paragraphs relate to the use of air ground voice communications.Distress and urgency communications procedures are prescribed by the International Civil Aviation Organization ( ICAO), however, and have decided advantages over the informal procedure described above. Distress and Urgency ProceduresĪ pilot who encounters a distress or urgency condition can obtain assistance simply by contacting the air traffic facility or other agency in whose area of responsibility the aircraft is operating, stating the nature of the difficulty, pilot's intentions and assistance desired. FAA Form 7233−4 International Flight Plan UAS Pilot Testing, Certification and Responsibilities.Aeronautical Charts and Related Publications.Bird Hazards and Flight Over National Refuges, Parks, and Forests.Cold Temperature Barometric Altimeter Errors, Setting Procedures and Cold Temperature Airports (CTA).Barometric Altimeter Errors and Setting Procedures.

Aircraft Rescue and Fire Fighting Communications.National Security and Interception Procedures.Pilot/Controller Roles and Responsibilities.Operational Policy/Procedures for the Gulf of Mexico 50 NM Lateral Separation Initiative.Operational Policy/Procedures for Reduced Vertical Separation Minimum (RVSM) in the Domestic U.S., Alaska, Offshore Airspace and the San Juan FIR.Radio Communications Phraseology and Techniques.Air Navigation and Obstruction Lighting.Aeronautical Lighting and Other Airport Visual Aids.Performance-Based Navigation (PBN) and Area Navigation (RNAV).Code of Federal Regulations and Advisory Circulars.

Aircraft crashes atc communications