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c) information regarding the readability of the aircraft TWA NINE SIX THREE MADRID - ATC CLEARS
transmission. TWA NINE SIX THREE TO DESCEND TO NINE
THOUSAND FEET
5.2.1.8.3 PANS.- The test transmission and reply
thereto should be recorded at the aeronautical station. Aircraft (acknowledging):
CLEARED TO DESCEND TO NINE THOUSAND
5.2.1.8.4 PANS.- When the tests are made, the following FEET - TWA NINE SIX THREE
readability scale should be used:
Station (denoting accuracy of readbackj.
Readability Scale MADRID
1 Unreadable
2 Readable now and then
3 Readable but with dzfficulty
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.
5.2.1.9.2.3 When acknowledgement of receipt is transmitted
by an aeronautical station:
1) to an aircraft station: it shall comprise the call sign of
the aircraft, followed if considered necessary by the call
sign of the aeronautical station;
2) to another aeronautical station: it shall comprise the
call sign of the aeronautical station that is
acknowledging receipt.
Annex 10 - Aeronautical Telecomrmtnications Volume I1
5.2.1.9.2.3.1 PANS.- An aeronautical station should
acknowledge position reports and other Jlight progress reports
by reading back the report and terminating the readback by its
call sign, except that the readback procedure may be
suspended temporarily whenever it will alleviate congestion
on the communication channel.
5.2.1.9.2.4 PANS.- It is permissible for verzfication for
the receiving station to read back the message as an additional
acknowledgement of receipt. In such instances, the station to
which the information 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 RECEIED " after 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
"CORRECTION, I SAY AGAIN before transmitting the
message a second time.
5.2.1.9.4.3 Recommendation.- When an operator
transmitting a message considers that reception is likely to be
dzfficult, he should transmit the important elements of the
message twice.
5.2.1.9.4.4 If the receiving operator is in doubt as to the
correctness of the message received, he shall request repetition
either in full or in part.
5.2.1.9.4.5 If repetition of an entire message is required,
the words "SAY AGAIN shall be spoken. If repetition of a
portion of a message is required, the operator shall state: "SAY
AGAIN ALL BEFORE ...( first word satisfactorily received)";
or "SAY AGAIN.. .(word before missing portion) TO.. .(word
after missing portion)"; or "SAY AGAIN ALL AFTER ...( last
word satisfactorily received)".
5.2.1.9.4.6 Recommendation.- SpeczJic items shou2d be
requested, as appropriate, such as "SAY AGAIN
ALTIMETER ", "SAY AGAIN WIND".
5.2.1.9.4.7 If, in checking the correctness of a readback,
an operator notices incorrect items, he shall transmit the words
"NEGATIVE I SAY AGAIN at the conclusion of the
readback followed by the correct version of the items
concerned.
5.2.1.9.5 "Operations normal" reports
PANS.- When "operations normal" reports are transmitted
by aircraft, they should consist of the prescribed call followed
by the words "OPERATIONS NORMAL".
5.2.2 Establishment and assurance
of communications
5.2.2.1 Communications watch/
Hours of service
5.2.2.1.1 During flight, aircraft stations shall maintain
watch as required by the appropriate Authority and shall not
cease watch, except for reasons of safety, without informing
the aeronautical station(s) concerned.
5.2.2.1.1.1 Aircraft on long over-water flights, or on
　
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