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5.2.1.7.2.2.1 The aircraft radiotelephony call signs shown
in 5.2.1.7.2.1. l , with the exception of Type c), may be
abbreviated in the circumstances prescribed in 5.2.1.7.3.3.1.
Abbreviated call signs shall be in the following form:
Type a) -the first character of the registration and at
least the last two characters of the call sign;
Type b) - the telephony designator of the aircraft
operating agency, followed by at least the last
two characters of the call sign;
Chapter 5 Annex 10 - Aeronautical Telecommunications
Table 5-1. Examples of full call signs and abbreviated call signs
(see 5.2.1.7.2.1 and 5.2.1.7.2.2)
Full call sign N 57826 *CESSNA *CITATION VARIG SCANDINAVIAN
FABCD FABCD PVMA 937
Abbreviated N26 CESSNA CITATION VARIG (no abbreviated
call sign CD CD MA form)
or or or or
N826 CESSNA CITATION VARIG
BCD BCD VMA
* Examples illustrate the application of Note 1 to 5.2.1.7.2.1.1
Type c) - no abbreviated form.
N o t e . Either the name of the aircraft manufacturer or of
the aircraft model may be used in place of the Jirst character
in Type a).
5.2.1.7.3 Radiotelephony procedures
5.2.1.7.3.1 An aircraft shall not change the type of its
radiotelephony call sign during flight, except temporarily on
the instruction of an air traffic control unit in the interests of
safety.
5.2.1.7.3.1.1 Except for reasons of safety no transmission
shall be directed to an aircraft during take-off, during the last
part of the final approach or during the landing roll.
5.2.1.7.3.2 Establishment of radiotelephony
communications
5.2.1.7.3.2.1 Full radiotelephony call signs shall always
be used when establishing communication. The calling
procedure of an aircraft establishing communication shall be in
accordance with Table 5-2.
5.2.1.7.3.2.2 PANS.- Stations having a requirement to
transmit information to all stations likely to intercept should
preface such transmission by the general call ALL STATIONS,
followed by the identification of the calling station.
N o t e . No reply is expected to such general calls unless
individual stations are subsequently called to acknowledge
receipt.
5.2.1.7.3.2.3 The reply to the above calls shall be in
accordance with Table 5-3.
5.2.1.7.3.2.4 PANS.- When a station is called but is
uncertain of the identFfication of the calling station, it should
reply by transmitting the following:
STATION CALLING . . . (station called) SAY AGAIN YOUR
CALL SIGN
N o t e . The following example illustrates the application of
this procedure:
(CAIRO station replying)
STATION CALLING CAIRO (pause) SAY AGAIN
YOUR CALL SIGN
5.2.1.7.3.2.5 Communications shall commence with a call
and a reply when it is desired to establish contact, except that,
when it is certain that the station called will receive the call,
the calling station may transmit the message, without waiting
for a reply from the station called.
5.2.1.7.3.2.6 Interpilot air-to-air communication shall be
established on the air-to-air channel 123.45 MHz by either a
directed call to a specific aircraft station or a general call,
taking into account conditions pertaining to use of this
channel.
N o t e . For conditions on use of air-to-air channels see
Annex 10, Volume 4.1.3.2.1, also Volume 11, 5.2.2.1.1.4.
5.2.1.7.3.2.6.1 PANS.- As the aircraft may be guarding
more than one frequency, the initial call should include the
distinctive channel identzfication "INTERPILOT".
N o t e . The following examples illustrate the application of
this calling procedure.
CLIPPER 123 - SABENA 901 - INTERPILOT - DO
YOU READ
ANY AIRCRAFT VICINITY OF 30 NORTH 160 EAST
- JAPANAIR 401 - INTERPILOT - OVER
Annex 10 - Aeronautical Telecomrmtnications Volume I1
Table 5-2. Radiotelephony calling procedure* (see 5.2.1.7.3.2.1)
Designation of the station called NEW YORK RADIO NEW YORK RADIO NEW YORK RADIO
Designation of the station calling GABCD** SPEEDBIRD ABCD* * AEROFLOT 32 1 **
* In certain cases where the call is initiated by the aeronautical station, the call may be eflected by transmission of
coded tone signals.
** iXth the exception of the telephony designators and the Wpe of airera$, each character in the call sign shall be spoken
separately. When individual letters are spelled out, the radiotelephory spelling alphabet prescribed in 5.2.1.3
shall be used Numbers are to be spoken in accordance with 5.2.1.4.
Table 5-3. Radiotelephony reply procedure (see 5.2.1.7.3.2.3)
Designation of the station called GABCD* SPEEDBIRD ABCD* AEROFLOT 321 *
Designation of the answering station NEW YOKK RADIO NEW YOKK RADIO NEW YOKK RADIO
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