CAP 413
Radiotelephony Manual
Chapter 2 Page 3
1.4
Transmission of Numbers
1.4.1
The syllables to be emphasised are underlined.
1.4.2
All numbers, except those contained in paragraph 1.4.2 b) shall be transmitted by
pronouncing each digit separately as follows:
a) When transmitting messages containing aircraft callsigns, altimeter settings, flight
levels (with the exception of FL100, 200, 300 etc. which are expressed as ‘Flight
Level (number) HUN DRED’), headings, wind speeds/directions, pressure settings,
airspeed, transponder codes and frequencies, each digit shall be transmitted
separately; examples of this convention are as follows:
Table 2
Numeral or numeral
element
Latin alphabet representation
0
ZERO
1
WUN
2
TOO
3
TREE
4
FOWER
5
FIFE
6
SIX
7
SEVEN
8
AIT
9
NINER
Decimal
DAYSEEMAL
Hundred
HUN DRED
Thousand
TOUSAND
Table 3
Number
Transmitted as
Pronounced as
BAW246
Speedbird Two Four Six
SPEEDBIRD TOO FOWER SIX
FL100
Flight Level One Hundred
FLIGHT LEVEL WUN HUN DRED
FL180
Flight Level One Eight Zero
FLIGHT LEVEL WUN AIT ZERO
150 Degrees
One Five Zero Degrees
WUN FIFE ZERO DEGREES
18 Knots
One Eight Knots
WUN AIT KNOTS
122.1
One Two Two Decimal One
WUN TOO TOO DAYSEEMAL WUN
(Squawk) 6500
Six Five Zero Zero
SIX FIFE ZERO ZERO
31 March 2011
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