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visibility one thousand
visibility seven hundred
transmitted as
RVR six hundred
RVR one thousand
seven hundred
5.2.1.4.1.3 Numbers containing a decimal point shall be
transmitted as prescribed in 5.2.1.4.1.1 with the decimal point
in appropriate sequence being indicated by the word
DECIMAL.
Note 1 .Th e following examples illustrate the application
of this procedure:
Number Transmitted as
Annex 10 - Aeronautical Telecommunications
Time Statement
0920 (9:20 A.M.) TOO ZE-RO
or ZE-RO NIN-er TOO ZE-RO
1643 (4:43 P.M.) FOW-er TREE
or WUN SIX FOW-er TREE
5.2.1.4.2 Verzfication of numbers
5.2.1.4.2.1 When it is desired to verify the accurate
reception of numbers the person transmitting the message shall
request the person receiving the message to read back the
numbers.
5.2.1.4.3 Pronunciation of numbers
5.2.1.4.3.1 When the language used for communication is
English, numbers shall be transmitted using the following
pronunciation:
Numeral or
numeral element
9
Decimal
Hundred
Thousand
Pronunciation
ZE-RO
WUN
TOO
TREE
FOW-er
FIFE
SIX
SEV-en
AIT
NIN-er
DAY-SEE-MAL
HUN-dred
TOU-SAND
100.3 ONE ZERO ZERO DECIMAL THREE N o t e . The syllables printed in capital letters in the above
38 143.9 THREE EIGHT ONE FOUR THREE list are to be stressed; for example, the two syllables in ZE-RO
DECIMAL NINE are given equal emphasis, whereas the jirst syllable of FO W-w
is given primary emphasis.
Note 2 .Fo r identzfication of VHFf requencies the number
of digits used after the decimal point are determined on the 5.2.1.5 Transmitting technique
basis of the channel spacing (5.2.1.7.3.4.3 refers to
frequencies separated by 25 kHz, 5.2.1.7.3.4.4 refers to 5.2.1.5.1 PANS.- Each written message should be read
frequencies separated by 8.33 kHz). prior to commencement of transmission in order to eliminate
unnecessary delays in communications.
Note 3 .Th e channellingfiequency pairing relationship
for 8.33 kHz and 25 kHz is found in Table 4-1 (bis), 5.2.1.5.2 Transmissions shall be conducted concisely in a
Volume T l normal conversational tone.
5.2.1.4 1 4 PANS.- When transmitting time, only the Note.See the language proficiency requirements in the
minutes of the hour should normally be required. Each digit Appendix to Annex 1.
should be pronounced separately. However, the hour should be
included when any possibility of confusion is likely to result. 5.2.1.5.3 PANS.- Speech transmitting technique should
be such that the highest possible intelligibility is incorporated
N o t e . The following example illustrates the application of in each transmission. Fulfilment of this aim requires that air
this procedure when applying the provisions of 5.2.1.2.2: crew and ground personnel should:
Annex 10 - Aeronautical Telecomrmtnications Volume I1
a) enunciate each word clearly and distinctly; "Permission for proposed action
granted."
APPROVED
BREAK
b) maintain an even rate of speech not exceeding 100
words per minute. When a message is transmitted to an
aircraft and its contents need to be recorded the
spealnng rate should be at a slower rate to allow for the
writing process. A slight pause preceding and following
numerals makes them easier to understand;
"I hereby indicate the separation
between portions of the message."
(To be used where there is no clear
distinction between the text and other
portions of the message.)
BREAK BREAK "I hereby indicate the separation
between messages transmitted to different
aircraft in a very busy
environment."
c) maintain the speaking volume at a constant level;
d) be familiar with the microphone operating techniques
particularly in relation to the maintenance of a constant
distance from the microphone 7f a modulator with a
constant level is not used; CANCEL
CHECK
"Annul the previously transmitted
clearance."
e) suspend speech temporarily 7f it becomes necessary to
turn the head away from the microphone. "Examine a system or procedure."
(Not to be used in any other context. No
5.2.1.5.4 Recommendation.- Speech transmitting tech- answer is normally expected,)
nique should be adapted to the prevailing communications
conditions. CLEARED "Authorized to proceed under the
conditions specified."
5.2.1.5.5 PANS.- Messages accepted for transmission
should be transmitted in plain language or ICAO phraseologies
without altering the sense of the message in any way. Approved
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