Transmission of numbers – Part 1
Numbers shall be transmitted using the following pronunciation:
– Syllables to be stressed are underlined.
Numbers
Code
Pronunciation
Audio
0
Zero
ZI RHO
1
One
WUN
2
Two
TOU
3
Three
TREE
4
Four
FOW EH
5
Five
FIFE
6
Six
SIX
7
Seven
SEV EN
8
Eight
AIT
9
Nine
NIN EH
100
Hundred
HUN DRED
1000
Thousand
TOU SAND
, (frequency)
Decimal
DAY SEE MAL
.
Point
POINT
All numbers, with few exceptions explained in ‘Tranmission of numbers (part 2)’, shall be transmitted by pronouncing each digit separately.
Examples:
Heading
100°
ONE ZERO ZERO DEGREES
260°
TWO SIX ZERO DEGREES
335°
THREE THREE FIVE DEGREES
Wind direction and speed
150 degrees 10 kts
ONE FIVE ZERO DEGREES TEN KNOTS
80 degrees 15 kts
EIGHT ZERO DEGREES FIFTEEN KNOTS
gusting 25 kts
GUSTING TWENTY FIVE KNOTS
Transponder code
6230
SQUAWK SIX TWO THREE ZERO
7600
SQUAWK SEVEN SIX ZERO ZERO
Altimeter setting (QNH)
1012
QNH ONE ZERO ONE TWO
1025
QNH ONE ZERO TWO FIVE
Runway
06
RUNWAY ZERO SIX
24L
RUNWAY TWO FOUR LEFT
Flight level
FL75
FLIGHT LEVEL SEVEN FIVE
FL200
FLIGHT LEVEL TWO ZERO ZERO
FL350
FLIGHT LEVEL THREE FIVE ZERO
According to the ICAO DOC 9432 Radiotelephony Manual, FL 100, FL 200, etc are pronounced “FLIGHT LEVEL ONE-ZERO-ZERO”, and “FLIGHT LEVEL TWO-ZERO-ZERO”.
“FLIGHT LEVEL (number) HUNDRED” follows the French DGAC and the British CAA patterns.