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coded tone signals.
** With the exception of the telephony designators and the type of aircraf, each character in the call sign shall be spoken
separately. When individual letters are spelled out, the radiotelephony 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* AEROF'LOT 32 1 *
Designation of the answering station NEW YORK RADIO NEW YORK RADIO NEW YORK RADIO
Invitation to proceed with
transmission GO AHEAD GO AHEAD GO AHEAD
* With the exception ofthe telephony designators and the type ofaircraft, each character in the call signshall be spoken
separately. When individual letters are spelled out, the radiotelephony spelling alphabet prescribed in 5.2.1.3 shall be
used. Numbers are to be spoken in accordance with 5.2.1.4.
5.2.1.7.3.3 Subsequent radiotelephony
communications
5.2.1.7.3.3.1 Abbreviated radiotelephony call signs, as
prescribed in 5.2.1.7.2.2, shall be used only after satisfactory
communication has been established and provided that no
confusion is likely to arise. An aircraft station shall use its
abbreviated call sign only after it has been addressed in this
manner by the aeronautical station.
5.2.1.7.3.3.2 After contact has been established, continuous
two-way communication shall be permitted without further
identification or call until termination of the contact.
5.2.1.7.3.3.3 In order to avoid any possible confusion,
when issuing ATC clearances and reading back such clearances,
controllers and pilots shall always add the call sign of
the aircraft to which the clearance applies.
5.2.1.7.3.4 Indication of transmitting channel
5.2.1.7.3.4.2 PANS.- When no confusion is likely to
arise, only the first two digits of the High Frequency (in Wit)
need be used to identify the transmitting channel.
Note.- The following example illustrates the application of
this procedure:
(PAA 325 calling Kingston on 8 871 kHz)
KINGSTON CLIPPER THREE TWO FIVE - ON EIGHT
EIGHT
5.2.1.7.3.4.3 PANS.- Except as specified in
5.2.1.7.3.4.4 all six digits of the numerical designator should
be used to identify the transmitting channel in VHF radiotelephony
communications, except in the case of both thefifth
and sixth digits being zeros, in which case only the first four
digits should be used.
Note 1.- The following examples illustrate the application
of the procedure in 5.2.1.7.3.4.3:
5.2.1.7.3.4.1 PANS.- As the aeronautical station Channel Transmitted as
operator generally guards more than one frequency, the call
should be followed by an indication of the frequency used 118.000 ONE ONE EIGHT DECIMAL ZERO
unless other suitable means of identifying the frequency are 118.005 ONE ONE EIGHT DECIMAL ZERO ZERO
known to exist. FIVE
2411 1/05
No. 80
Chapter 5 Annex 10 - Aeronautical Telecommunications
118.010 ONE ONE EIGHT DECIMAL ZERO ONE
ZERO
118.025 ONE ONE EIGHT DECIMAL ZERO TWO
FlVE
118.050 ONE ONE EIGHT DEClMAL ZERO FlVE
ZERO
118.100 ONE ONE EIGHT DECIMAL ONE
Note 2.- Caution must be exercised with respect to the
indication of transmitting channels in VHF radiotelephony
communications when all sir digits of the numerical designator
are used in airspace where communication channels are
separated by 25 kHz, because on aircraft installations with a
channel separation capability of 25 kHz or more, it is only
possible to select the first five digits of the numerical designator
on the radio management panel.
Note 3.- The numerical designator corresponds to the
channel identification in Annex 10, Volume V, Table 4-1 (bis).
5.2.1.7.3.4.4 PANS.- In airspace where all VHF voice
communications channels are separated by 25 kHz or more
and the use of six digits as in 5.2.1.7.3.4.3 is not substantiated
by the operational requirement determined by the appropriate
authorities, the first five digits of the numerical designator
should be used, except in the case of both the jifth and sixth
digits being zeros, in which case only the first four digits
should be used.
Note I.- The following examples illustrate the application
of the procedure in 5.2.1.7.3.4.4 and the associated settings of
the aircraji radio management panel for communication
equipment with channel separation capabilities of 25 kHz and
8.33/25 kHz:
Channel Transmitted as
Radio management
panel setting for
communication
equipment with
8.33/
25 kHz 25 kHz
(5 digits) (6 digits)
I1 8.000 ONE ONE EIGHT 118.00 118.000
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