ARLA/CLUSTER: Socorro Urgência e Segurança
Gmt
ct1czt gmail.com
Domingo, 22 de Outubro de 2017 - 01:35:29 WEST
Para quem nunca conheceu e tenha curiosidade de conhecer, eis aqui aquilo
que é (era) o procedimento Internacional de Socorro, Urgência e Segurança.
*INTERNATIONAL DISTRESS PROCEDURES *
*Applicability*
The procedures in this Chapter are in accordance with ITU radio regulations
and are obligatory in the Maritime Mobile Service and for communications
between aircraft stations and stations of the Maritime Mobile Service.
*Authority*
The distress call and message shall be sent only on the authority of the
master or person responsible for the ship, aircraft or any other vehicle
carrying the mobile station.
*Distress Procedure*
Distress procedure comprises all communications relating to the immediate
assistance required by the mobile station in distress. Distress procedure
consists of:
*a. In CW:*
(1) The alarm signal; followed in order by:
(2) The distress call and an interval of two minutes;
(3) The distress call;
(4) The distress message;
(5) Two dashes of ten to fifteen seconds duration each;
(6) The call sign of the Station in distress.
*b. In voice:*
(1) The alarm signal (whenever possible) followed by;
(2) The distress call;
(3) The distress message.
*c. In RATT/NBDP:*
(1) The distress call;
(2) The distress message.
When time is vital, the second step of the CW procedure (or even the first
and second steps) may be omitted or shortened. These two steps of the
distress procedure may also be omitted in circumstances where transmission
of the alarm signal is considered unnecessary.
*Distress Signal*
The distress signal consists of:
a. In CW - the group SOS, transmitted as a single signal in which the
dashes are emphasised so as to be clearly distinguished from the dots.
b. In voice - the word MAYDAY, pronounced as the French expression
“m’aiderâ€.
c. In RATT - the signal SOS is to be typed.
*Alarm Signal*
The alarm signal consists of:
1. In CW - A serious of 12 dashes sent in one minute, the duration of
each dash being four seconds with an interval of one second between each
dash.
2. In voice - Two substantially sinusoidal audio frequency tones
transmitted alternatively. One tone has a frequency of 2200 Hz and the
other 1300 Hz. The duration of each tone is 250 milliseconds. The signal is
to be sent continuously for a period of from 30 seconds to one minute.
The purpose of the alarm signal is to alert the operators on watch or to
activate 2182khz watchkeeping receivers to warn operators that a distress
call or message is to follow.
*Note:* With the introduction of GMDSS, Digital Selective Calling (DSC)
entered service. DSC is a paging technique used to automate the initial
call between two stations. It operates on MF, HF and VHF marine bands for
distress, urgency and safety alerting.
*Distress Call*
The distress call consists of:
*a. In CW:*
(1) The distress signal SOS, sent three times.
(2) The prosign DE.
(3) The call sign of the mobile station in distress sent three times.
*b. In voice:*
(1) The distress signal MAYDAY, spoken three times.
(2) The proword THIS IS.
(3) The call sign or other identification of the mobile station in
distress, spoken three times.
*c. In RATT/NDPB:*
(1) The distress signal SOS, typed three times.
(2) The prosign DE.
(3) The call sign of the mobile station in distress sent three times.
The distress call shall not be addressed to a particular station and
acknowledgement of receipt shall not be given before the distress message
which follows it is sent.
*Distress Message*
The distress message shall consist of:
1. The distress signal SOS, or MAYDAY as appropriate.
2. The name, or other identification, of the mobile station in distress.
3. Particulars of its position.
4. The nature of the distress and the kind of assistance desired.
5. Any other information which might facilitate the rescue The distress
message, preceded by the distress call (and the alarm signal if necessary),
shall be repeated at intervals, until an answer is received. The intervals
shall, however, be sufficiently long for stations preparing to reply to
start their sending apparatus.
*Aircraft Distress Message*
Aircraft distress procedures are detailed in chapter 3. Under normal
circumstances an aircraft distress message will be transmitted on the
Aeronautical Mobile Service frequency in use, however, an aircraft
transmitting in the Maritime Mobile Service shall as a general rule, and if
time permits, include in its distress message the following information:
1. Estimated position and time of estimate.
2. Heading in degrees (state whether magnetic or true).
3. Indicated air speed.
4. Altitude.
5. Type of aircraft.
6. Nature of distress and type of assistance required.
7. Any other information which might facilitate the rescue (including
the intention of the person in command, such as forced alighting on the sea
or crash landing).
*Position*
As a general rule, a ship signals its position in latitude and longitude,
with the numerals suffixed by NORTH or SOUTH, and EAST or WEST. In CW the
prosign AAA is used to separate the degrees from the minutes. When known,
the true bearing and the distance (in nautical miles) from a known
geographical point may be given.
*Distress Frequency*
1. 500 kHz. The frequency 500 kHz is the International Distress
Frequency for CW. The distress message, preceded by the distress call, must
be repeated at intervals on this frequency, especially during the periods
of silence. The periods of silence in all ITU regions have a duration of
three minutes, commencing at 15 and 45 minutes past each hour.
*Note*: With effect from 1 February 1992, monitoring of 500 kHz is no
longer required.
1. 2182 kHz. The frequency 2182 kHz (and its supplementary frequencies
4125 and 6215 kHz) is the International Distress frequency for voice. The
silence periods for this frequency in ITU regions 1 and 3 have a duration
of three minutes commencing on the hour and half hour.
*Note:* Although in ITU region 2, Canadian coast stations observe the above
silence periods.
1. 156.8 MHz. The frequency 156.8 MHz is the International Distress,
Safety and Calling frequency for the maritime mobile VHF radiotelephone
service. To facilitate the receptions of distress calls all transmissions
on 156.8 MHz shall be kept to a minimum and shall not exceed one minute.
1. When the mobile station in distress receives no answer to a distress
message sent on a distress frequency, the message may be repeated on any
other available frequency on which attention might be attracted. If time
permits, the mobile station should transmit an appropriate phrase or
operating signal (Q signal) before shifting frequency.
*Direction Finding*
1. In CW, to permit direction-finding stations to determine the position
of the station in distress, the transmission of two 10 to 15 seconds dashes
followed by the station call sign may be repeated at frequent intervals if
necessary.
1. Immediately before a crash landing or a forced landing (on land or
sea) of an aircraft, as well as before total abandonment of a ship or an
aircraft, the radio equipment should be set for continuous emission.
*Receipt of Distress*
Stations of the mobile service which receive a distress message which is,
beyond any possible doubt, in their vicinity, shall obtain the approval of
the local commander before acknowledging receipt, wherever practicable.
However, in areas where reliable communications with one more coast
stations are practicable, mobile stations should defer this acknowledgement
for a short time so that a land or coast station may acknowledge receipt.
The acknowledgement of receipt of a distress message shall be given in the
following format:
*a. In CW:*
(1) The distress signal SOS.
(2) The call sign of the station sending the distress message, sent three
times.
(3) The prosign DE.
(4) The call sign of the station acknowledging receipt, sent three times.
(5) The group RRR.
(6) The distress signal SOS.
*b. In voice:*
(1) The distress signal MAYDAY.
(2) The call sign or other identification of the station sending the
distress message, spoken three times.
(3) The proword THIS IS.
(4) The call sign or other identification of the station acknowledgement
receipt, spoken three times.
(5) The word RECEIVED (or RRR spoken as ROMEO in case of language
difficulties).
(6) The distress signal MAYDAY.
*c. In RATT/NBDP:*
(1) The distress signal SOS.
(2) The call sign of the station sending the distress message, sent three
times.
(3) The prosign DE.
(4) The call sign of the station acknowledging receipt, sent three times.
(5) The group RRR.
(6) The distress signal SOS.
Stations of the mobile service which receive a distress message from a
mobile station which, beyond any possible doubt, is not in their vicinity,
shall allow a short interval of time to elapse before acknowledging receipt
of the message in order to permit stations nearer to the station in
distress to acknowledge receipt without interference.
However, stations which received a distress message from mobile station
which, beyond any possible doubt, is a long distance away need not
acknowledge receipt (see paragraph 218).
*Control of Distress Traffic*
The control of distress traffic is the responsibility of the mobile station
in distress or the station originating or relaying the distress message, on
behalf of the station in distress. These stations may, however, delegate
control to another station.
*Silence*
The station in distress or the station controlling distress traffic may
impose silence either on all stations of the mobile service in the area or
on any station which interferes with the distress traffic. It shall address
these instructions "to all Stations" (CQ) or to one station only, according
to the circumstances. In either case the form of the signal will be:
1. By CW - The signal QRT SOS.
2. By voice - The words SEELONCE MAYDAY.
3. By RATT/NBDP - The signal QRT SOS.
*Silence Imposed by Mobile Station Near the Distress*
If it is believed to be essential, any station on the mobile service near
the ship, aircraft or other vehicle in distress may also impose silence. In
this case the distress signal is substituted by the word DISTRESS followed
by imposing station's call sign as follows:
1. In CW - QRT DISTRESS followed by the transmitting station's call sign.
2. In voice - SEELONCE DISTRESS followed by the transmitting station's
call sign.
3. In RATT/NBDP - QRT DISTRESS followed by the transmitting station's
call sign.
*Station Monitoring Distress Traffic*
Any station of the mobile service which has knowledge of distress traffic
and which cannot itself assist the station in distress shall continue to
follow such traffic until it is evident that assistance is being provided.
Until they receive a message indicating that normal working may be resumed
all stations which are aware of the distress traffic, and which are not
taking part in it, are forbidden to transmit on the frequencies on which
the distress traffic is being passed.
*Follow-up Message*
Every mobile station which acknowledges receipt of a distress message must,
on the order of the person in command, transmit as soon as possible the
following information in the order shown:
1. Its identification.
2. Its position.
3. The speed at which it is proceeding towards, and the approximate time
it will take to reach, the mobile station in distress.
4. If the position of the station in distress appears doubtful, the true
bearing of that station preceded by the operating signal QTE.
Before transmitting this message, the station shall ensure that it will not
interfere with the emissions of other stations better situated to render
immediate assistance to the station in distress.
*Action by Station not itself in Distress*
A mobile station or land station which learns that a mobile station is in
distress shall transmit a distress message in any of the following cases:
1. When that station in distress is not itself in a position to send a
distress message.
2. When the master or person responsible for the ship, aircraft or other
vehicle not in distress, considers that further help is necessary.
3. When, although not in a position to render assistance, it has heard a
distress message which has not been acknowledged.
The transmission of a distress message under these conditions shall be made
on one or more of the international distress frequencies (500 kHz (AM),
2182 kHz (USB), 156.8 MHz (FM), or on any other frequency that may be used
in case of distress. The station transmitting the message shall take all
necessary steps to notify the authorities who may be able to render
assistance.
*Relayed Distress Message*
The relayed distress message shall be preceded wherever possible by the
alarm signal.
In addition, the transmission of the distress message will always be
preceded by the following call:
*a. In CW:*
(1) The signal DDD SOS SOS SOS DDD;
(2) The prosign DE.
(3) The call sign of the transmitting station, sent three times.
*b. In voice:*
(1) The signal MAYDAY RELAY spoken three times;
(2) The proword THIS IS.
(3) The call sign or other identification of the transmitting station
spoken three times.
*c. In RATT/NBDP:*
(1) The signal DDD SOS SOS SOS DDD;
(2) The prosign DE.
(3) The call sign of the transmitting station, sent three times.
*Cessation of Distress Traffic*
When distress traffic has ceased on a frequency which has been used for
distress traffic, the station which has controlled this traffic shall
transmit on that frequency a message addressed "to all stations" (CQ)
indicating that normal working may be resumed. This message consists of:
a*. In CW*:
(1) The distress signal SOS.
(2) The call "to all stations" (CQ), sent three times.
(3) The prosign DE.
(4) The call sign of the station sending the message.
(5) The time of handing in the message.
(6) The name and call sign of the mobile station which was in distress.
(7) The operating signal QUM ("normal working may be resumed").
(8) The prosign AR.
*b. In voice:*
(1) The distress signal MAYDAY.
(2) The call "HELLO ALL STATIONS" or CQ (SPOKEN AS CHARLIE QUEBEC) spoken
three times.
(3) The proword THIS IS.
(4) The call sign or other identification of the station sending the
message.
(5) The time of handing in of the message.
(6) The name and call sign of the station which was in distress.
(7) The words SEELONCE FEENEE.
(8) The proword OUT.
*c. In RATT/NBDP:*
(1) The distress signal SOS.
(2) The call "to all stations" (CQ), sent three times.
(3) The prosign DE.
(4) The call sign of the station sending the message.
(5) The time of handing in the message.
(6) The name and call sign of the mobile station which was in distress.
(7) The operating signal QUM ("normal working may be resumed").
(8) The prosign AR.
When a station in distress has delegated control of distress working to
another station, the person in charge of the station in distress should,
when he considers silence no longer justified, immediately inform the
controlling station, who will act in accordance with the above.
*Cessation of Silence*
When complete silence is no longer necessary on a frequency which is being
used for distress traffic, the station controlling the traffic shall
transmit on that frequency a message addressed "to all stations" (CQ)
indicating that restricted working may be resumed. This message has the
same format as detailed in para 220 with the Operating Signal QUZ replacing
QUM or the words PRU-DONCE (pronounced as the French word "prudence")
replacing SEELANCE FEENEE in the CW and VOICE messages respectively.
*AIRCRAFT DISTRESS PROCEDURES*
*Applicability*
The procedures detailed in Chapter 2 are generally applicable to aircraft
in distress and shall be employed in communications between aircraft
stations and stations in the maritime mobile service. However, the
following procedures will normally be employed by stations within the
aeronautical mobile service, and will be used by aircraft operating on
military communications network.
*Action by Aircraft in Distress*
An aircraft commander should have no hesitation in declaring a state of
distress if there is any indication that such exists. As soon as distress
conditions arise, all installed automatic emergency equipment (e.g. IFF
etc.) should be switched on. When the distress conditions cease to exist, a
message is to be sent cancelling the distress condition.
*Distress Signal*
The distress signal shall be used at the commencement of the first distress
communication. It shall also be used, if it is considered necessary, at the
commencement of any subsequent distress communication.
*Distress Message*
In addition to being preceded by the distress call (SOS or MAYDAY,
depending on the mode of communication), preferably transmitted three
times, the distress message sent by an aircraft in distress should:
1. Be on the air-ground frequency in use at the time.
2. Consist of as many as possible of the following elements, in the
following order:
(1) Position and time
(2) Heading
(3) Air speed
(4) Altitude
(5) Aircraft type
(6) Nature of distress
(7) Captain's intentions
(8) Any other information that may facilitate rescue
1. ICAO distress message should consist of as many as possible of the
following elements, in the following order:
(1) Nature of Distress
(2) Captains Intentions
(3) Position
(4) Heading
(5) Altitude
(6) Any other information that may facilitate rescue
*Distress Message*
The provision above are not intended to prevent:
1. The distress message of an aircraft in distress being made on another
aeronautical mobile frequency, if considered necessary or desirable. In
many areas, a continuous watch by aeronautical stations is maintained on
121.5 MHz and/or 243MHz.
2. The distress message of an aircraft in distress being broadcast, if
time and circumstances make this course preferable.
3. The aircraft transmitting on the maritime mobile international
distress frequencies.
4. The aircraft using any means at its disposal to attract attention and
make known its condition (including the activation of the appropriate IFF
mode and code).
5. Any station taking any means at its disposal to assist an aircraft in
distress.
6. Any variation of the elements of the distress message when the
transmitting station is not itself in distress, provided that such
situation is clearly stated in the distress message.
*Action by Station Addressed*
The station addressed by the station in distress, or the first station
acknowledging the distress message
shall:
1. Immediately acknowledge the distress message.
1. Take control of the communications, or specifically and clearly
transfer that responsibility, advising the aircraft if a transfer is made.
2. Take immediate action to ensure that all necessary information is
made available as soon as possible to:
(1) The Air Traffic Service (ATS) unit concerned.
(2) The aircraft operating agency concerned, or its representative, in
accordance with pre-established arrangements. (This requirement does not
have priority over any other action which involves the safety of the flight
in distress, or of any other flight in the area, or which might affect the
progress of the expected flights in the area.)
1. Warn other stations as appropriate, in order to prevent the transfer
of traffic to the frequency of the distress communication.
*Imposition of Silence*
The station in distress, or the station in control of the distress traffic,
may impose silence, either on all stations of the mobile service in the
area or on any station which interferes with the distress traffic. It shall
address these instructions "to all stations" or to one station only,
according to circumstances. In either case the form of the signal will be:
1. By CW - QRT SOS
2. By voice - STOP TRANSMITTING - MAYDAY
3. By RATT - QRT SOS
The use of these signals is reserved for the aircraft station in distress
and for the station controlling the distress traffic.
*Action by all Other Stations*
Distress communications have absolute priority over all other
communications, and a station aware of them shall not transmit on the
frequency concerned, unless:
1. The distress is cancelled or the distress traffic is terminated.
2. All distress traffic is transferred to other frequencies.
3. It had itself to render assistance.
Any station which has knowledge of distress traffic, shall nevertheless
continue listening to such traffic until it is obvious that assistance is
being provided.
*Termination of Distress*
When an aircraft is no longer in distress, it shall transmit a message
cancelling the distress condition.
When the station which has controlled the distress communication traffic
becomes aware that the distress condition is ended, it shall take immediate
action to ensure that this information is made available, as soon as
possible, to:
1. The ATS unit concerned.
2. The aircraft operating agency concerned, or its representative, in
accordance with preestablished arrangements.
*Termination of Silence*
The distress communication and silence condition shall be terminated by
transmitting a message, on the frequency or frequencies being used for
distress traffic. This message shall be transmitted in the shown format.
This message shall be originated only by the station controlling the
communications when, after reception of the message cancelling the distress
condition, it is authorised to do so by the appropriate authority
*Acknowledging Receipt of a Distress Message*
*RATT CW VOICE*
1. Distress Signal SOS (if considered necessary)
1. Distress Signal SOS (if considered necessary)
1. Distress Signal MAYDAY (if considered necessary)
2. Call sign of station sending message sent three times
2. Call sign of station sending distress messages sent three times
2. Call sign or other identification of station in distress - spoken three
times
3. The prosign DE 3. The prosign DE 3. The proword THIS IS
4. The call sign of station acknowledging receipt - sent three times
4. The call sign of station acknowledging receipt - sent three times
4. The call sign or other identification of station acknowledging receipt -
three times
5. The group RRR 5. The group RRR 5. The word ROGER
6. The distress signal SOS 6. The distress signal SOS 6. The distress
signal MAYDAY
7. The prosign AR 7. The prosign AR 7. The proword OUT
*Message Format for Cessation of Distress Traffic*
*RATT CW VOICE*
1. Distress signal SOS (if considered necessary)
1. Distress signal MAYDAY (if considered necessary)
2. Call CQ 2. Call CQ ("to all stations") 2. The call HELLO ALL STATIONS
three times
3. Prosign DE 3. Prosign DE 3. Proword THIS IS
4. Call sign of station sending message (once) 4. Call sign of station
sending message (once) 4. Identification of station transmitting message
(once)
5. Time of handing in of message 5. Time of handing in of message 5. Time
of handing in of message
6. Identification and call sign of station which was in distress
6. Identification and call sign of station which was in distress
6. Identification and call sign of station which was in distress
7. Operating signal QUM 7. Operating signal QUM (Normal working may be
resumed).
7. The words DISTRESS TRAFFIC ENDED
8. The prosign AR 8. The prosign AR 8. The proword OUT
*Examples of Aircraft Distress Traffic*
*Traffic RATT CW VOICE*
Distress Call SOS SOS SOS DE PQ6F PQ6F PQ6F AR
SOS SOS SOS DE PQ6F PQ6F PQ6F AR
MAYDAY MAYDAY MAYDAY THIS IS SOLENT ONE SIX SOLENT ONE SIX SOLENT ONE SIX
OUT
Distress Message SOS SOS SOS DE PQ6F PQ6F PQ6F QTH 15 NM SE DOVER 1212Z QTL
270 QTJ 200 QAH 8000 FT B-29 ENGINE FAILURE DITCHING PQ6F K
SOS SOS SOS DE PQ6F PQ6F PQ6F QTH 15 NM SE DOVER 1212Z QTL 270 QTJ 200 QAH
8000 FT B-29 ENGINE FAILURE DITCHING PQ6F K
MAYDAY MAYDAY MAYDAY THIS IS SOLENT ONE SIX SOLENT ONE SIX SOLENT ONE SIX –
POSITION ONE FIVE NAUTICAL MILES SOUTH EAST DOVER ONE TWO ONE TWO ZULU
HOURS – HEADING (stating whether magnetic or true) TWO SEVEN ZERO
-INDICATED AIR SPEED TWO HUNDRED KNOTS - EIGHT THOUSAND FEET - BRAVO TWO
NINE - ENGINE FAILURE - DITCHING - SOLENT ONE SIX OVER
*Relay Distress Message*
DDD SOS SOS SOS DDD AFA3 DE RY7Z BT PQ6F ENGINE FAILURE DITCHING QTH 3821N
07345W QAH 16000 QTL 260 BT K
DDD SOS SOS SOS DDD AFA3 DE RY7Z BT PQ6F ENGINE FAILURE DITCHING QTH 3821N
07345W QAH 16000 QTL 260 BT K
MAYDAY RELAY MAYDAY RELAY MAYDAY RELAY ANDREWS THIS IS FIREBRAND TWO
ZEROBREAK SOLENT ONE SIX ENGINE FAILURE DITCHING POSITION THREE EIGHT TWO
ONE NORTH ZERO SEVEN THREE FOUR FIVE WEST FLIGHT LEVEL ONE SIX ZERO HEADING
TWO SIX ZERO OVER
*Acknowledgement of Distress Message*
(SOS) PQ6F DE AFA3 RRR SOS AR
(SOS) PQ6F DE AFA3 RRR SOS AR
(MAYDAY) SOLENT ONE SIX THIS IS ANDREWS ANDREWS ROGER MAYDAY OUT (The word
RECEIVED is prescribed for maritime mobile service vice ROGER)
Imposing Silence (SOS) CQ CQ CQ DE AFA3 QRT SOS AR
(SOS) CQ CQ CQ DE AFA3 QRT SOS AR
(MAYDAY) ALL STATIONS ALL STATIONS ALL STATIONS THIS IS ANDREWS STOP
TRANSMITTING - MAYDAY OUT
*Cancellation of Distress*
(SOS) AFA3 DE PQ6F QTA DISTRESS ENGINES OPERATING QRF BASE K
(SOS) AFA3 DE PQ6F QTA DISTRESS ENGINES OPERATING QRF BASE K
(MAYDAY) ANDREWS THIS IS SOLENT ONE SIX CANCEL DISTRESS ENGINES OPERATING
AM RETURNING BASE OVER
*Terminating Silence*
(SOS) CQ CQ CQ DE AFA3 1421Z PQ6F QUM AR
(SOS) CQ CQ CQ DE AFA3 1421Z PQ6F QUM AR
(MAYDAY) ALL STATIONS ALL STATIONS ALL STATIONS THIS IS ANDREWS - TIME ONE
FOUR TWO ONE ZULU - SOLENT ONE SIX – DISTRESS TRAFFIC ENDED - OUT
*URGENCY AND SAFETY COMMUNICATIONS*
*Urgency Signal*
1. The URGENCY SIGNAL (XXX OR PAN PAN) indicates that the calling
station has a very urgent message to transmit concerning the safety of a
ship, aircraft, or other vehicle, and/or the safety of personnel. It has
priority over all other communications except distress. All stations which
hear it shall take care not to interfere with the transmission which
follows the URGENCY SIGNAL. The composition of the signal is:
(1) CW - Three transmissions of group XXX, sent with the letters of each
group and each successive group clearly separated from each other.
(2) VOICE - Three transmissions of the group of words PAN PAN, pronounced
as the French word "PANNE".
(3) RATT - Three transmissions of group XXX, sent with the letters of
each group and each successive group clearly separated from each other. The
URGENCY SIGNAL is transmitted before the call.
b. The URGENCY SIGNAL may be sent only on the authority of the person
in command of the ship, aircraft or other vehicle carrying the mobile
station. It may be transmitted by a land station only with the approval of
the responsible authority. Within the aeronautical Mobile Service the
Urgency Signal shall be sent at the commencement of the first Urgency
communications, and should be used if it is considered necessary at the
commencement of any subsequent communications.
1. The automatic alarm signal may be used preceding the urgency signal
and message concerning the loss of a person or persons overboard when
assistance of other ships is required and cannot be obtained satisfactorily
by the use of the urgency signal only.
*Frequencies*
1. Maritime Mobile Service. The Urgency Signal and the message following
it shall be sent on one or more of the international distress frequencies
(refer to chapter 6) or any other frequency which may be used in case of
distress. However, the message shall be transmitted on a working frequency:
(1) In the case of a long message or a medical call; or (2) In areas of
heavy traffic when repeating the message transmitted on any of the
international distress frequencies.
1. Aeronautical Mobile Service. In the aeronautical mobile service the
Urgency Signal and the message which follows it should be sent on the
air-ground frequency in use at the time. If unsuccessful, contact should be
attempted on any of the SAR assistance frequencies indicated
*Urgency Messages*
In the aeronautical mobile service an Urgency Message should:
1. Be preceded by the Urgency Signal (XXX or PAN) preferably transmitted
three times.
2. Consist of as many of the following elements spoken distinctly and,
if possible, in the following order:
(1) Name of Station Addressed or "All Stations"
(2) Identification of Aircraft
(3) Request for Navigation Assistance (If Required)
(4) Position and Time
(5) Heading
(6) Air speed
(7) Altitude
(8) Aircraft Type
(9) Available Flight Time
(10) Nature of Emergency
(11) Captain's Intentions
In the maritime mobile service, urgency messages may be addressed either to
all stations or to a particular station.
*Action by Station Addressed*
Within the aeronautical mobile service the station addressed will normally
be the station communicating with the aircraft or in whose area of
responsibility the aircraft is operating. The station addressed by an
aircraft reporting an Urgency condition shall:
a. Acknowledge the Urgency message.
b. Take immediate action to ensure that all necessary information is
made available, as soon as possible, to:
. (1) The ATS unit concerned.
(2) The aircraft operating agency concerned.
c. If necessary, exercise control of communications concerned
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