---
title: "SERA.14035 Transmission of numbers in radiotelephony — ANNEX: Rules of the Air, SERA · Avioverse"
description: "Transmission of numbers (1) All numbers used in the transmission of aircraft call sign, headings, wind direction and speed, and runway shall be…"
url: "https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-14/sera-14035"
---

# SERA.14035 Transmission of numbers in radiotelephony

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

IR Implementing rule

## SERA.14035 Transmission of numbers in radiotelephony

(a) Transmission of numbers

(1) All numbers used in the transmission of [aircraft](https://avioverse.aero/glossary/easa/aircraft) call sign, headings, wind direction and speed, and [runway](https://avioverse.aero/glossary/easa/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](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

CALL SIGN, [HEADING](https://avioverse.aero/glossary/easa/heading), [RUNWAY](https://avioverse.aero/glossary/easa/runway) AND WIND

The following examples illustrate the application.

| [aircraft](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

FLIGHT LEVELS

The following examples illustrate the application.

| flight levels | transmitted as                                                            |
| ------------- | ------------------------------------------------------------------------- |
| FL 180        | flight [level](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

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

GM Guidance material

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

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

GM Guidance material

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

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

GM Guidance material

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

[ALTITUDE](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

CLOUD [HEIGHT](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

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

GM Guidance material

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

[RUNWAY](https://avioverse.aero/glossary/easa/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

GM Guidance material

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

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

GM Guidance material

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

TRANSMISSION OF NUMBERS FOR [RADIOTELEPHONY](https://avioverse.aero/glossary/easa/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](https://avioverse.aero/glossary/easa/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](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-14)

Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.