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DECIMAL ZERO
118.025 ONE ONE EIGHT 118.02 118.025
DECIMAL ZERO TWO
I1 8.050 ONE ONE EIGHT 118.05 118.050
DECIMAL ZERO FIVE
118.075 ONE ONE EIGHT 118.07 118.075
DECIMAL ZERO SEVEN
11 8.100 ONE ONE EIGHT 118.10 118.100
DECIMAL ONE
Note 2.- Caution must be exercised with respect to the
indication of transmitting channels in VHF radiotelephony
communications when f i e digits of the numerical designator
are used in airspace where aircraft are also operated with
channel separation capabilities of 8.33/25 kHz. On aircraft
installations with a channel separation capability of 8.33 kHz
and more, it is possible to select six digits on the radio
management panel. It should therefore be ensured that the
fifth and sixth digits are set to 25 kHz channels (see Note I).
Note 3.-The numerical designator corresponds to the
channel identification in Annex 10. Volume V, Table 4-1 (bis).
5.2.1.8 Testprocedures
5.2.1.8.1 PANS.- The form of test transmissions should
be as follows:
a) the identification of the station being called;
b) the aircraji identification:
c) the words "RADIO CHECK";
d) the frequency being used
5.2.1.8.2 PANS.- The reply to a test transmission
should be as follows:
a) the identification of the aircraft;
b) the identification of the aeronautical station replying;
C) information regarding the readability of the aircraff
transmission.
5.2.1.8.3 PANS.- The test transmission and reply
thereto should be recorded at the aeronautical station.
5.2.1.8.4 PANS.- When the tests are made, the
following readability scale should be used:
Readability Scale
I Unreadable
2 Readable now and then
3 Readable but with dificulty
4 Readable
5 Perfectly readable
5.2.1.9 Exchange of communications
5.2.1.9.1 Communications shall be concise and unambiguous,
using standard phraseology whenever available.
5.2.1.9.1.1 Recommendation.- Abbreviated procedures
should only be used after initial contact has been established
and where no confusion is likely to arise.
2411 1/05
No. 80
Annex 10 - Aeronautical Telecommunications Volume ZZ
5.2.1.9.2 Acknowledgement of receipt. The receiving call sign, except that the readback procedure may be
operator shall make certain that the message has been received suspended temporarily whenever it will alleviate congestion
correctly before acknowledging receipt. on the communication channel.
Note.- Acknowledgement of receipt is not to be confused
with acknowledgement of intercept in radiotelephony network
operations.
5.2.1.9.2.1 When transmitted by an aircraft station, the
acknowledgement of receipt of a message shall comprise the
call sign of that aircraft.
5.2.1.9.2.2 PANS.- An aircraji station should
acknowledge receipt of important air trafic control messages
or parts thereof by reading them back and terminating the
readback by its radio call sign.
Note I.- Air trafJic control clearances, instructions and
information requiring readbock are specified in PANS-ATM
(Doc 4444).
Note 2.- The following example illustrates the application
of this procedure:
(ATC clearance by network station to an aircm.)
Station:
TWA NINE SIX THREE MADRID
Aircraji:
MADRID TWA NINE SIX THREE - GO AHEAD
Station:
TWA NINE SIX THREE MADRID - ATC CLEARS
TWA NINE SIX THREE TO DESCEND TO NINE
THOUSAND FEET
5.2.1.9.2.4 PANS- It is permissible for verification for
the receiving station to read back the message as an additional
acknowledgement of receipt. In such instances, the station to
which the informarion is read back should acknowledge the
correctness of readback by transmitting its call sign.
5.2.1.9.2.5 PANS.- If both position report and other
information - such as weather reports - are received in the
same message, the information should be acknowledged with
the words such as "WEATHER RECENED" afier the position
report has been read back, except when intercept of the
information is required by other network stations. Other
messages should be acknowledged, the aeronautical station
transmitting its call sign only.
5.2.1.9.3 End of conversation. A radiotelephone conversation
shall be terminated by the receiving station using its
own call sign.
5.2.1.9.4 Corrections and repetitions
5.2.1.9.4.1 When an error has been made in transmission,
the word "CORRECTION" shall be spoken, the last correct
group or phrase repeated, and then the correct version
transmitted.
5.2.1.9.4.2 If a correction can best be made by repeating
the entire message, the operator shall use the phrase
　
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