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A
A condition concerning the safety of a person on board of an aircraft, or within sight, and requiring immediate assistance.
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B
A condition concerning the attitude of an aircraft when intercepting the localizer during an ILS approach.
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C
A condition of being threatened by serious and/or imminent danger and requiring immediate assistance.
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D
A condition concerning the safety of an aircraft or of a person on board, but which does not require immediate assistance.
A distress situation is by definition a condition of being threatened by serious and/or imminent danger and of requiring immediate assistance. A distress situation needs immediate assistance and this is the difference between distress and urgency (urgency does not require immediate assistance).
If a pilot of an aircraft encounters an emergency, this situation shall be indicated by a radio call starting with the phrase "MAYDAY" spoken three times.
In a distress situation, the pilots shall transmit the distress call on the air-ground frequency currently in use.
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