CAP 413
Radiotelephony Manual
Chapter 8 Page 6
1.11
Relayed Emergency Message
Any aeronautical station or aircraft knowing of an emergency incident may transmit a
distress message whenever such action is necessary to obtain assistance for the
aircraft or vessel in distress. In such circumstances, it should be made clear that the
aircraft transmitting is not itself in distress.
1.12
Imposition of Silence
1.12.1
Transmissions from aircraft in distress have priority over all other transmissions. On
hearing a distress call, all stations must maintain radio silence on that frequency
unless the distress is cancelled or the distress traffic is terminated; all distress traffic
has been transferred to other frequencies; the station controlling communications
gives permission; it has itself to render assistance. Any station which has knowledge
of distress traffic, and which cannot itself assist the station in distress, shall
nevertheless continue listening to such traffic until it is evident that assistance is
being provided. Stations should take care not to interfere with the transmission of
urgency calls.
1.12.2
The aircraft in distress or the station in control of a distress incident may impose
silence either on all stations in the area or on any particular station that interferes with
distress transmissions. In either case, the message should take the following form:
or,
1.12.3
The aeronautical station acknowledging a distress message on a particular frequency
may consider it prudent to transfer other aircraft from that frequency in order to avoid
any disruption of transmission from or to the emergency aircraft.
MAYDAY MAYDAY MAYDAY
Milthorpe Tower, G-ABCD, have
intercepted MAYDAY from G-BJRD,
I say again G-BJRD Cessna 172
engine failure forced landing 10
miles west of Wicken VOR, 1000
feet descending, heading 120, IMC
rating, over
G-ABCD, Milthorpe Tower, Roger
your relayed MAYDAY from G-BJRD
All stations, Milthorpe Tower, stop
transmitting. MAYDAY
G-ABCD, stop transmitting. MAYDAY
MAYDAY, G-BJRD, remain this
frequency, Break, Break, all other
aircraft contact Milthorpe Tower on
123.825, out.
17 November 2011
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