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and distress traffic MAYDAY
b) Urgency messages. inclnding PAN, PAN
messages preceded by the or PAN: PAN
nlcdical transports signal YED I CN..
C) Communications relating to
direction finding -
d) Flight safety messages -
e) Meteorological messages -
5.1.4 Except as otherwise provided, the responsibility of
establishing communicarion shall rest with tlle station Ilaving f ) Flight regularity messages -
traftic to transnlit.
Note 1.- Messa~esc oncerning acts of ~~nlalc$~inlt er-
Note.- In certuirl cusps wlzen SELCAL is rlseil the ference constitute a case o f exceptional circumstances which
pmccd~rres re.specting thc establishment of co~itmnnicutions ?nay preclude the rrse of recognized communicution proceditres
are contained i n 5.2.4. used to cktcrmine message category and priority.
ANNEX 10 - VOLUME I1 27/11/03
No. 78
,41rntx 10 - Aero~~rrulicaTle lecomrnunicatiort.~ Volume 11
Note 2.- A NOTAM may qrialzflrfor arry qf rhe cnre,qories.
or pr-ior-ities.c ) ro.fj irzclr~siv~T'h. e deci.sion ( i s to ~:hicApr ioril~
will depend on the conte~ztso ffhe NOTAM and its impnrtunce
to fhe air~ruftc oncerned.
5.1.8.1 Distress rnessages and distress trafic shall be
handled in accordance with the provisions of 5.3.
5.1.8.2 Urgency rnessages nnd urgency trfSic, including
mcssagcs prcccded by thc inedical transports signal, shall be
handled in accordance with the provisions of 5.3.
Note.- The term "medical transports" i.c clefi~zed in rhe
1949 Genetvi Corzvciztians and Additional Pmtocnls (see also
RR S33 Section 111) and rcfers to "u~zmy eans oJ transportation
by land, water; or uir; wlzether nzi[itan, or civilian, pernlanent
or rf!nl.pornv. u.rsitgned excl~rsively to medical tran.cportation
and under thr corzrrol (?f CI Cornperent uurkol-itj qj'a Parqr to
tlze corzflict ".
5. I .S.3 Conunrt~~icationrcsl utirlg ro direction.finding shall
be handled in accorclance with Chapter 6.
5.1.8.4 Flight safery messages shall comprise the
following:
1) movement and control messages [see PANS-.ATM
[:Doc 444)l;
2) rnessages onginated by an aircraft operating agency or
by an aircraft. of immediate concern to an aircraft in
flight:
3) meteorological advice of immediate concern to an
aircraft in I-light or about in dcparl (individually
communicated or for broadcast);
4) other messages concerning aircraft in fight or about to
depart.
5.1 .X.5 Meteorological messages shall comprise meteorological
information to or from aircraft, other thw those in
5.1.8.4, 3).
5.1 .8.6 Flight regulari~ lnessnges shall comprise the
following:
L ) message,s regarding the operation or maintenance of
facilities essential for the safety 01- regularily of aircraft
ope.ratinn:
2) messages concerning the servicing 01 aircraft;
3) instruc~ions Lo aircraft operating agency representatives
cunccrning changcs in requirements for passengers and
crew caused by unavoidable deviations from normal
operating schedule,^. Individiral requirements of passengers
or crew shall not be admissible in this type of
message:
4) inessages concerning non-rourinc landings to be made
by the aircral't;
5) messages concerning aircraft parts and materials
urgently required;
6) messages concerning changes in aircraft operating
schedulcs.
5.1.8.6.1 Air traffic services units using direct pilotcontroller
communication channels shall only he required to
handle flight regularity messages provided [his can be
achieved without interference with lhcir primary role and no
other channels are available for he handling 01 such messages.
Note.- 1-11e rnessages nr 5.1.8.3, 2) and 5.1 8.6. I ) to 6,
typrfi some oj the o~~etrioan ul control cornrnunicarions defined
in Chupter I .
5.1.8.7 Recommendation.- ~Messnges having the surne
priorify shorild, irr general. be trnnsnlitted in the order in
r+.hich they are received for rra~zsrnission.
5.1.6.8 Interpilot air-to-air communication shall comprise
messages related lo any matter affecting safety and regularity
of flight. The category and priority of these messages shall bc
determined on the basis of their content in accordance with
5.1.8.
5.1.9 Cancellatiorl of messages
5.1.9.1 Incomplete rransmissions. If a message bas not
been co~npletely transmitted when insliuclions to cancel are
received, the station transmitting the mcssagc shall instruct the
receiving station to disregard the incomplete transmission. This
shall be effected jn radiotelephony by use of an appropriate
phrase.
5.1.9.2 Complete trailsn?issions
Recommendation.- When a complcred message
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