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clearance requests;
g) messages originated by aircraft operating agencies
reporting an aircraR arrival or departure;
h) messages concerning parts and materials urgently
required for the operation of aircraft.
4.4.1.1.6 Aeronautical information services (AIS)
messages (priority indicator GG) shall comprise:
a) messages concerning NOTAMs;
b) messages concerning SNOWTAMs.
4.4.1.1.7 Aeronautical administrative messages (priority
indicator KK) shall comprise:
a) messages regarding the operation or maintenance of
facilities provided for the safety or regularity of aircraft
operations;
b) messages concerning the functioning of aeronautical
telecommunication services;
c) messages exchanged between civil aviation authorities
relating to aeronautical services.
4.4.1.1.8 Messages requesting information shall take the
same priority indicator as the category of message being
requested except where a higher priority is warranted for flight
safety.
4.4.1.1.9 Service messages (priority indicator us
appropriate). This category shall comprise messages originated
by aeronautical fixed stations to obtain information or
verification concerning other messages which appear to have
been transmitted incorrectly by the aeronautical fixed service,
confirming channel-sequence numbers, etc.
Annex 10 - Aeronautical Telecommunications Volume 11
4.4.1.1.9.1 Service messages shall be prepared in the
format prescribed in 4.4.2 or 4.4.15. In applying the provisions
of 4.4.3.1.2 or 4.4.15.2.1.3 to service messages addressed to an
aeronautical fixed station identified only by a location
indicator, this indicator shall be immediately followed by the
ICAO three-letter designator YFY, followed by an appropriate
8th letter.
4.4.1.1.9.2 Service messages shall be assigned the
appropriate priority indicator.
4.4.1.1.9.2.1 Recommendation.- When service
messages refer to messages previously transmitted, the priority
indicator assigned should he that used,for the message(s) to
which thq refer:
4.4.1.3 Routing of messages
4.4.1.3.1 All communications shall be routed by the most
expeditious route available to effect delivery to the addressee.
4.4.1.3.2 Predetermined diversion routing arrangements
shall be made, when necessary, to expedite the movement of
communication traffic. Each communication centre shall have
the appropriate diversion routing lists, agreed to by the
Administration(s) operating the communication centres
affected and shall use them when necessary.
4.4.1.3.2.1 Recommendation.- Diversion routing should
be initiated:
I) in a,fully autornatic communication centre:
4.4.1.1.9.3 Service messages correcting errors in a) immediately ufter detection of the circuit outage,
transmission shall be addressed to all the addressees that will when the trufic is to be diverted via a,fully automatic
have received the incorrect transmission.
communication centre;
4.4.1.1.9.4 A reply to a service message shall be b) within a 10-minute period after detection of the
addressed to the station which originated the initial service circuit outage, when the trufic is to he diverted via a
message. nonTfully automatic communication centre;
4.4.1.1.9.5 Recommendation.- The text of all service 2) in a nonTfully automatic communication centre within a
messages should he as concise as possible. 10-minute period after detection of the circuit outage.
4.4.1.1.9.6 A service message, other than one
aclcnowledging receipt of SS messages, shall be further
identified by the use of the abbreviation SVC as the first item
in the text.
4.4.1.1.9.7 When a service message refers to a message
previously handled, reference to the previous message shall be
made by use of the appropriate transmission identification (see
4.4.2.1.1 b) and 4.4.15.1.1 b)) or the filing time and originator
indicator groups (see 4.4.4 and 4.4.15.2.2) identifying the
reference message.
4.4.1.2 Order of priority
Service message nottfication of the diversion requirement
should he provided where no bilateral or multilateral
prearranged agreements exist.
4.4.1.3.3 As soon as it is apparent that it will be
impossible to dispose of traffic over the aeronautical fixed
service within a reasonable period, and when the traffic is held
at the station where it was filed, the originator shall be
consulted regarding further action to be talcen, unless:
a) otherwise agreed between the station concerned and the
originator; or
b) arrangements exist whereby delayed traffic is
automatically diverted to commercial telecommunication
services without reference to the originator.
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