These rules have to be followed when using voice mode only.

First of all, some figures and numbers are not pronounced as they usually are :
0 : is pronounced ZERO instead of the letter "O".

3 : is pronounced TREE and not THREE.

9 : second syllable is emphasized, as if there is a final R: NINER.

1000 : is pronounced TOUSAND and not THOUSAND.

CHARACTER	MORSE CODE	TELEPHONY	PHONIC (PRONUNCIATION)
1	• – – – –	One	(WUN)
2	• • – – –	Two	(TOO)
3	• • • – –	Three	(TREE)
4	• • • • –	Four	(FOW-ER)
5	• • • • •	Five	(FIFE)
6	– • • • •	Six	(SIX)
7	– – • • •	Seven	(SEV-EN)
8	– – – • •	Eight	(AIT)
9	– – – – •	Nine	(NIN-ER)
0	– – – – –	Zero	(ZEE-RO)

Figures

Figures indicating hundreds and thousands in round number, as for ceiling heights, and upper wind levels up to 9,900 shall be spoken in accordance with the following.

EXAMPLE 1
500 five hundred
EXAMPLE 2
4,500 four thousand five hundred

Numbers above 9,900 shall be spoken by separating the digits preceding the word "thousand."

EXAMPLE 1
10,000 one zero thousand
EXAMPLE 2
13,500 one three thousand five hundred

Transmit airway or jet route numbers as follows.

EXAMPLE 1
V12 Victor Twelve
EXAMPLE 2
J533 J Five Thirty-Three

(All other numbers shall be transmitted by pronouncing each digit.)

EXAMPLE
10 one zero

When a radio frequency contains a decimal point, the decimal point is spoken as "DECIMAL."

EXAMPLE
122.1 one two two DECIMAL one

NOTE Some countries use "Point" for the decimal.

Altitudes and Flight Levels
Up to the transtion level, state the separate digits of the thousands plus the hundreds if appropriate.

EXAMPLE 1
12,000 one two thousand
EXAMPLE 2
12,500 one two thousand five hundred

At and above the transition level, state the words "flight level" followed by the separate digits of the flight level.

EXAMPLE 1
190 Flight Level One Niner Zero
EXAMPLE 2
275 Flight Level Two Seven Five

Directions
The three digits of bearing, course, heading, or wind direction should always be magnetic. The word "true" must be added when it applies.

EXAMPLE 1
(Magnetic course) 005 zero zero five
EXAMPLE 2
(True course) 050 zero five zero true
EXAMPLE 3
(Magnetic bearing) 360 three six zero
EXAMPLE 4
(Magnetic heading) 100 heading one zero zero
EXAMPLE 5
(Wind direction) 220 wind two two zero

Speeds
The separate digits of the speed followed by the word "KNOTS." Except, controllers may omit the word "KNOTS" when using speed adjustment procedures; e.g., "REDUCE/INCREASE SPEED TO TWO FIVE ZERO."

EXAMPLE
(Speed) 250 two five zero knots
(Speed) 190 one niner zero knots
The separate digits of the Mach Number preceded by "Mach."
EXAMPLE
(Mach number) 1.5 Mach one point five
(Mach number) 0.64 Mach point six four
(Mach number) 0.7 Mach point seven

Time
Coordinated Universal Time (UTC or ZULU) should be used for all operations. The word "local" or the time zone equivalent shall be used to denote local when local time is given during radio and telephone communications. The term "Zulu" may be used to denote UTC.

EXAMPLE
0920 UTC zero niner two zero,
zero one two zero pacific or local,
or one twenty AM

A reference may be made to local daylight or standard time utilizing the 24-hour clock system. The hour is indicated by the first two figures and the minutes by the last two figures.

EXAMPLE
0000 zero zero zero zero
0920 zero niner two zero

Time may be stated in minutes only (two figures) in radiotelephone communications when no misunderstanding is likely to occur.

Current time in use at a station is stated in the nearest quarter minute in order that pilots may use this information for time checks. Fractions of a quarter minute less than 8 seconds are stated as the preceding quarter minute; fractions of a quarter minute of 8 seconds or more are stated as the succeeding quarter minute.

EXAMPLE
0929:05 time, zero niner two niner
0929:10 time, zero niner two niner and one-quarter

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L1 - Numbers Pronounciation