an aircraft on final approach is starting the missed approach procedure.
imminent danger threatens the aircraft and immediate assistance is required.
the aircraft is diverting from the route cleared because of a thunderstorm and asks for immediate reclearance.
The aircraft has an urgent message to transmit concerning the safety of a ship, aircraft or other vehicle, but immediate assistance is not required.
Urgency is defined as a condition concerning the safety of an aircraft or other vehicle, or of some person on board or within sight, but which does not require immediate assistance. The difference between urgency and distress is that distress requires immediate assistance while urgency does not.
The procedures are quite similar in the urgency and distress case. Also, do not forget that an urgency situation can turn into a distress situation anytime.
- The signal sent by radiotelephony consisting of the spoken words "PAN PAN, PAN PAN, PAN PAN" ("PAN PAN" spoken three times) means that the aircraft has a very urgent message to transmit concerning the safety of a ship, aircraft or another vehicle, but immediate assistance is not required.
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