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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