SERA.14035 Transmission of numbers in radiotelephony

ANNEX: Rules of the Air · Regulation (EU) No 923/2012 · EAR revision 26 Aug 2025

IRImplementing rule

SERA.14035Transmission of numbers in radiotelephony

(a)Transmission of numbers

(1)All numbers used in the transmission of aircraft call sign, headings, wind direction and speed, and runway shall be transmitted by pronouncing each digit separately.

(i)Flight levels shall be transmitted by pronouncing each digit separately, except for the case of flight levels in whole hundreds.

(ii)The altimeter setting shall be transmitted by pronouncing each digit separately, except for the case of a setting of 1 000 hPa, which shall be transmitted as “ONE THOUSAND”.

(iii)All numbers used in the transmission of transponder codes shall be transmitted by pronouncing each digit separately except that, when the transponder codes contain whole thousands only, the information shall be transmitted by pronouncing the digit in the number of thousands followed by the word “THOUSAND”.

(2)All numbers used in transmission of other information than those described in point (a)(1) shall be transmitted by pronouncing each digit separately, except that all numbers containing 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’.

(3)In cases where there is a need to clarify the number transmitted as whole thousands and/or whole hundreds, the number shall be transmitted by pronouncing each digit separately.

(4)When providing information regarding the relative bearing to an object or to conflicting traffic in terms of the 12-hour clock, the information shall be given pronouncing the digits together such as ‘TEN O'CLOCK’ or ‘ELEVEN O'CLOCK’.

(5)Numbers containing a decimal point shall be transmitted as prescribed in point (a)(1) with the decimal point in appropriate sequence, indicated by the word ‘DECIMAL’.

(6)All six digits of the numerical designator shall be used to identify the transmitting channel in very high frequency (VHF) radiotelephony communications, except in the case of both the fifth and sixth digits being zeros, in which case only the first four digits shall be used.

IR · SERA.14035 — Regulation (EU) No 923/2012 · Regulation (EU) 2024/404 · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM1 SERA.14035(a)(1)Transmission of numbers in radiotelephony

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CALL SIGN, HEADING, RUNWAY AND WIND The following examples illustrate the application.

aircraft call signs	transmitted as
CCA 238	Air China two three eight
OAL 242	Olympic two four two

headings	transmitted as
100 degrees	heading one zero zero
080 degrees	heading zero eight zero

runway	transmitted as
27	runway two seven
30	runway three 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

GM · GM1 SERA.14035(a)(1) — Regulation (EU) No 923/2012 · ED Decision 2024/007/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM2 SERA.14035(a)(1)(i)Transmission of numbers in radiotelephony

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FLIGHT LEVELS The following examples illustrate the application.

flight levels	transmitted as
FL 180	flight level one eight zero
FL 200	flight level two hundred

GM · GM2 SERA.14035(a)(1)(i) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM3 SERA.14035(a)(1)(ii)Transmission of numbers in radiotelephony

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ALTIMETER SETTING The following examples illustrate the application.

altimeter setting	transmitted as
1009 hPa	QNH one zero zero nine
1000 hPa	QNH one thousand
993 hPa	QNH nine nine three

GM · GM3 SERA.14035(a)(1)(ii) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM4 SERA.14035(a)(1)(iii)Transmission of numbers in radiotelephony

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TRANSPONDER CODES The following examples illustrate the application.

transponder codes	transmitted as
2400	squawk two four zero zero
1000	squawk one thousand
2000	squawk two thousand

GM · GM4 SERA.14035(a)(1)(iii) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM5 SERA.14035(a)(2)Transmission of numbers in radiotelephony

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INDICATED AIRSPEED The following examples illustrate the application.

Indicated airspeed	transmitted as
250 knots	two five zero knots
300 knots	three hundred knots

GM · GM5 SERA.14035(a)(2) — Regulation (EU) No 923/2012 · ED Decision 2024/007R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM1 SERA.14035(a)(2)Transmission of numbers in radiotelephony

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ALTITUDE The following examples illustrate the application.

altitude	transmitted as
800	eight hundred
3 400	three thousand four hundred
12 000	one two thousand

GM · GM1 SERA.14035(a)(2) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM2 SERA.14035(a)(2)Transmission of numbers in radiotelephony

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CLOUD HEIGHT The following examples illustrate the application.

cloud height	transmitted as
2 200	two thousand two hundred
4 300	four thousand three hundred

GM · GM2 SERA.14035(a)(2) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM3 SERA.14035(a)(2)Transmission of numbers in radiotelephony

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VISIBILITY The following examples illustrate the application.

visibility	transmitted as
1 000	visibility one thousand
700	visibility seven hundred

GM · GM3 SERA.14035(a)(2) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM4 SERA.14035(a)(2)Transmission of numbers in radiotelephony

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RUNWAY VISUAL RANGE The following examples illustrate the application.

runway visual range	transmitted as
600	RVR six hundred
1 700	RVR one thousand seven hundred

GM · GM4 SERA.14035(a)(2) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM5 SERA.14035(a)(5)Transmission of numbers in radiotelephony

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DECIMALS The following examples illustrate the application.

number	transmitted as
100.3	ONE ZERO ZERO DECIMAL THREE
38 143.9	THREE EIGHT ONE FOUR THREE DECIMAL NINE

GM · GM5 SERA.14035(a)(5) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

GMGuidance material

GM1 SERA.14035(a)(6)Transmission of numbers in radiotelephony

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TRANSMISSION OF NUMBERS FOR RADIOTELEPHONY CHANNEL FREQUENCIES

(a)The following examples illustrate the application of the procedure.

Channel	Transmitted as
118.000	ONE ONE EIGHT DECIMAL ZERO
118.005	ONE ONE EIGHT DECIMAL ZERO ZERO FIVE
118.010	ONE ONE EIGHT DECIMAL ZERO ONE ZERO
118.025	ONE ONE EIGHT DECIMAL ZERO TWO FIVE
118.050	ONE ONE EIGHT DECIMAL ZERO FIVE ZERO
118.100	ONE ONE EIGHT DECIMAL ONE

(b)Caution must be exercised with respect to the indication of transmitting channels in VHF radiotelephony communications when all six digits of the numerical designator are used in airspace where communication channels are separated by 25 kHz, because on aircraft installations with a channel separation capability of 25 kHz or more, it is only possible to select the first five digits of the numerical designator on the radio management panel.

GM · GM1 SERA.14035(a)(6) — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

All rules in SECTION 14 Voice communication procedures

Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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