To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. -distress (Mayday), definition and when to use -frequencies to use -contents of Mayday message -urgency (Pan), definition and when to use -frequencies to use -relay of messages -maintenance of silence when distress/urgency call heard -cancellation of distress/urgency 6. Instrumentation – Helicopters -
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