General resources

General

Radio telephony procedures

Words and phrases

Transmission format AIP GEN 3.4

When initiating a transmission to ATS, pilots must commence the transmission with the callsign of the unit being addressed, followed by the aircraft callsign. A read-back of an ATS message will be terminated with the aircraft’s callsign.

When making a broadcast at a non-controlled aerodrome or in Class E or G airspace, the transmission must commence with the location followed by ‘traffic’, for example ‘Bundaberg traffic’, and at the end of the transmission, the name of the location, that is ‘Bundaberg’.

Read-back requirements AIP GEN 3.4; ENR 1.1

Pilots must transmit a correct read-back of ATC clearances, instructions and information which are transmitted by voice. For other than the ATC route clearance, only key elements of the following clearances, instructions, or information must be read back ensuring sufficient detail is included to indicate compliance:

  • an ATC route clearance in its entirety, and any amendments

  • en-route holding instructions
  • any route and holding point specified in a taxi clearance
  • any clearances, conditional clearances or instructions to hold short of, enter, land on, line-up on, wait, take-off from, cross, taxi or backtrack on, any runway
  • any approach clearance
  • assigned runway, altimeter settings directed to specific aircraft, radio and radio navigation aid frequency instructions

  • SSR codes, data link logon codes and
  • Level instructions, direction of turn, heading and speed instructions.

Conditional clearances AIP GEN 3.4

In all cases a conditional clearance will be given in the following order and consist of:

  • identification (callsign)
  • the condition (including position of the subject of the condition);
  • the clearance and
  • brief reiteration of the condition, for example:
    ATS: ‘(aircraft callsign) behind A340 on short final, line up
    [runway (number)] behind’
    Pilot: ‘behind the A340, lining up [runway (number)] (aircraft callsign)’.
    (See AIP ENR 1.1)

Route terminology AIP GEN 3.4

The phrase ‘flight planned route’ may be used to describe any route or portion thereof that is identical to that filed in the flight notification with sufficient routing details given to definitely establish the aircraft on its route.

Amended route or level AIP GEN 3.4

Whenever a situation arises whereby an aircraft, in the initial clearance, is cleared on a route and/or at a level other than that expected according to the flight notification, ATS will prefix the route and/or level details with the term ‘amended’ to alert the
pilot that the clearance is different to that expected. For example:

ATS: ‘(aircraft callsign) cleared to (destination) [amended route]
(route clearance details) [amended level] (level)’.

The prefix ‘amended’ will not be used:

  • when an initial level for ATC traffic management purposes has been issued as
    part of an airways clearance to an aircraft departing an active CTR – in which case
    ‘maintain’ shall be used or
  • during normal progressive climb/descent instructions.

When an issued airways clearance needs to be changed, ATS will prefix the new route and/or level details with the term ‘recleared’ to indicate to the pilot that a change has been made to the previous clearance and this new clearance supersedes the previous clearance or part thereof. The level will be stated in all clearance changes regardless of whether a change to the initially cleared level is made or not. For example:

ATS: ‘(aircraft callsign) recleared [to (destination)] [(route clearance
details)] (level)’.

Phonetic alphabet AIP GEN 3.4

Radiotelephony pronunciation of the phonetic alphabet is as follows:

A
Alpha
al fah
B
Bravo
brah voh
C
Charlie
char lee
D
Delta
dell tah
E
Echo
eck ho
F
Foxtrot
foks trot
G
Golf
golf
H
Hotel
hoh tel
I
India
in dee a
J
Juliet
jew lee ett
K
Kilo
key loh
L
Lima
lee mah
M
Mike
mike
N
November
no vem bar
O
Oscar
oss cah
P
Papa
pah pah
Q
Quebec
keh beck
R
Romeo
row me oh
S
Sierra
see air rah
T
Tango
tang go
U
Uniform
you nee form
V
Victor
vik tah
W
Whiskey
wiss key
X
X-ray
ecks ray
Y
Yankee
yang key
Z
Zulu
zoo loo

Numerals

Radiotelephony pronunciation of numbers shall be in the phonetic form as follows:

0
ze-ro
1
wun
2
too
3
tree
4
fow er
5
fife
6
six
7
sev en
8
ait
9
nin er
Decimal
day see mal
Hundred
hun dred
Thousand
tou sand


Transmission of numbers AIP GEN 3.4

All numbers used in the transmission of altitude, cloud height, visibility and runway visual range (RVR) information, which contain whole hundreds and whole thousands, must be transmitted by pronouncing each digit in the numbers of hundreds
or thousands followed by the word ‘hundred’ or ‘thousand’ as appropriate.
For example:

Altitudes
800
eight hundred
1500
one thousand five hundred
6715
six seven one five
10,000
one zero thousand
Cloud height
2200
two thousand two hundred
4300
four thousand three hundred
Visibility
200
two hundred
1500
one thousand five hundred
3000
three thousand
Runway visual range
700
seven hundred

All other numbers must be transmitted by pronouncing each digit separately.
For example:

Flight levels
FL180
flight level one eight zero
FL200
flight level two zero zero
Headings
150
one five zero
080
zero eight zero
300
three zero zero
Wind direction
020°
zero two zero degrees
100°
one zero zero degrees
210°
two one zero degrees
Wind speeds
70 kt
seven zero knots
18 kt, gusting 30
one eight knots gusting three zero
Mach number
0.84
decimal eight four
Altimeter setting
1000
one thousand
1027
one zero two seven

Standard words and phrases AIP GEN 3.4

The following words and phrases are to be used in radiotelephony communications, as appropriate, and have the meaning given:

Acknowledge
Let me know that you have received and understood the message
Affirm
Yes
Approved
Permission for proposed action granted
Break
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 separation between messages transmitted to different aircraft
in a very busy environment
Cancel
Annul the previously transmitted clearance
Check
Examine a system or procedure (no answer is normally expected)
Cleared
Authorised to proceed under the conditions specified
Confirm
Have you correctly received the following…?
Did you correctly receive this message?
Contact
Establish radio contact with…
Correct
That is correct
Correction
An error has been made in this transmission (or message indicated). The correct version is…
Disregard
Consider that transmission as not sent
How do you read
What is the readability of my transmission?
The readability scale is:
1 Unreadable
2 Readable now and then
3 Readable but with difficulty
4 Readable
5 Perfectly readable
I say again
Repeat for clarity or emphasis
Correct
That is correct
Maintain
Continue in accordance with the condition(s) specified, or in its literal sense, for example: ‘Maintain VFR’.
Mayday
My aircraft and its occupants are threatened by grave and imminent danger and/or I require immediate assistance
Monitor
Listen out on (frequency)
Negative
No
Permission is not granted
That is not correct
Over
My transmission is ended and I expect a response from you (not normally used in VHF communication)
Out
My transmission is ended and I expect no response from you (not normally used in VHF communication)
Pan pan
I have an urgent message to transmit concerning the safety of my aircraft, or other vehicle or of some person on board, or within sight, but I do not require immediate assistance
Read back
Repeat all, or the specified part, of this message back to me exactly as received
Recleared
A change has been made to your last clearance and this new clearance
supersedes your previous clearance or part thereof
Report
Pass me the following information
Request
Should like to know or I wish to obtain
Roger
I have received all of your last transmission
Say again
Repeat all or the following part of your last transmission
Speak slower
Reduce your rate of speech
Standby
Wait and I will call you
Verify
Check and confirm with originator
Wilco
Understand your message and will comply with it
Words twice
As a request: Communication is difficult. Please send every word or group
of words twice
As information: Since communication is difficult every word or group
of words in this message will be sent twice
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