Transmission of Numbers in Radiotelephony

5.2.1.4.1.1 Digit-by-Digit Transmission

All numbers, except as prescribed in 5.2.1.4.1.2, shall be transmitted by pronouncing each digit separately.

Note The following examples illustrate the application of this procedure (see 5.2.1.4.3.1 for pronunciation).

Aircraft call signs	Transmitted as
CCA 238	Air China two three eight
OAL 242	Olympic two four two

Flight levels	Transmitted as
FL 180	Flight level one eight zero
FL 200	Flight level two zero zero

Headings	Transmitted as
100 degrees	Heading one zero zero
080 degrees	Heading zero eight zero

Wind direction and speed	Transmitted as
200 degrees 70 knots	Wind two zero zero degrees seven zero knots
160 degrees 18 knots gusting 30 knots	Wind one six zero degrees one eight knots gusting three zero knots

Transponder codes	Transmitted as
2 400	Squawk two four zero zero
4 203	Squawk four two zero three

Runway	Transmitted as
27	Runway two seven
30	Runway three zero

Altimeter setting	Transmitted as
1 010	QNH one zero one zero
1 000	QNH one zero zero zero

5.2.1.4.1.2 Hundreds and Thousands

All numbers used in the transmission of altitude, cloud height, visibility and runway visual range (RVR) information, which contain whole hundreds and whole thousands, shall be transmitted by pronouncing each digit in the number of hundreds or thousands followed by the word HUNDRED or THOUSAND as appropriate. Combinations of thousands and whole hundreds shall be transmitted by pronouncing each digit in the number of thousands followed by the word THOUSAND followed by the number of hundreds followed by the word HUNDRED.

 Training reference only. Always defer to current approved manuals and official procedures.

Note The following examples illustrate the application of this procedure. See 5.2.1.4.3.1 (Pronunciation of numbers) for pronunciation).

Altitude	Transmitted as
800	Eight hundred
3 400	Three thousand four hundred
12 000	One two thousand

Cloud height	Transmitted as
2 200	Two thousand two hundred
4 300	Four thousand three hundred

Visibility	Transmitted as
1 000	Visibility one thousand
700	Visibility seven hundred

Runway visual range	Transmitted as
600	RVR six hundred
1 700	RVR one thousand seven hundred

5.2.1.4.1.3 Decimal Points

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 The following examples illustrate the application of this procedure:

Number	Transmitted as
100.3	ONE ZERO ZERO DECIMAL THREE
38 143.9	THREE EIGHT ONE FOUR THREE DECIMAL NINE

Note 2 For identification of VHF frequencies the number of digits used after the decimal point are determined on the 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 frequencies separated by 8.33 kHz).

Note 3 The channelling/frequency pairing relationship for 8.33 kHz and 25 kHz is found in Table 4-1 (bis), Volume V.

5.2.1.4.1.4 Time Transmission

PANS. When transmitting time, only the minutes of the hour should normally be required. Each digit should be pronounced separately. However, the hour should be included when any possibility of confusion is likely to result.

Note The following example illustrates the application of this procedure when applying the provisions of 5.2.1.2.2:

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 Verification

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 Guide

When the provisions of 5.2.1.2.2 (see below) are applied, numbers shall be transmitted using the following pronunciation:

Numeral or numeral element	Pronunciation
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

Note The syllables printed in capital letters in the above list are to be stressed; for example, the two syllables in ZE-RO are given equal emphasis, whereas the first syllable of FOW-er is given primary emphasis.