How should the digits of an aircraft call sign be pronounced in radiotelephony?

All numbers used in the transmission of aircraft call sign shall be transmitted by pronouncing each digit separately.

What is the correct way to transmit a flight level of 250 in radiotelephony?

Flight levels shall be transmitted by pronouncing each digit separately, except for the case of flight levels in whole hundreds. For a flight level of 250, you would pronounce each digit separately (e.g., 'TWO FIVE ZERO').

How should a flight level of 200 be transmitted?

Flight levels in whole hundreds are an exception to the rule of pronouncing each digit separately. A flight level of 200 would be transmitted as 'TWO HUNDRED'.

What is the correct phraseology for transmitting an altimeter setting of 1000 hPa?

The altimeter setting of 1 000 hPa shall be transmitted as 'ONE THOUSAND'.

How should a transponder code of 1200 be transmitted?

All numbers used in the transmission of transponder codes shall be transmitted by pronouncing each digit separately, except for whole thousands only. Since 1200 is not whole thousands only, it would be transmitted as 'ONE TWO ZERO ZERO'.

How many digits of the numerical designator should be used to identify a VHF channel when the fifth and sixth digits are not both zero?

All six digits of the numerical designator shall be used to identify the transmitting channel in VHF radiotelephony communications, except in the case of both the fifth and sixth digits being zeros.

When transmitting a VHF channel, when is it acceptable to use only the first four digits?

In the case of both the fifth and sixth digits being zeros, only the first four digits shall be used to identify the transmitting channel.

SERA.14035 Transmission of numbers in radiotelephony

Q: What is the rule for transmitting transponder codes that contain whole thousands only, such as 3000?

When 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'. For example, 3000 would be 'THREE THOUSAND'.

Q: For numbers other than those in point (a)(1), how should a number like 2500 be transmitted?

All numbers containing whole hundreds and whole thousands 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'. So 2500 would be 'TWO THOUSAND FIVE HUNDRED'.

Q: How should a number like 250 be transmitted when it is not covered by point (a)(1)?

All numbers containing whole hundreds shall be transmitted by pronouncing each digit in the number of hundreds followed by the word 'HUNDRED'. So 250 would be 'TWO HUNDRED FIFTY'.

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SERA.14035 Transmission of numbers in radiotelephony

Regulation (EU) 2024/404

(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.

Details

Source-Title: SERA.14035 Transmission of numbers in radiotelephony View latest amendments

Erulesid: ERULES-1963177438-9893 Compare versions

Domain: Aerodromes, Air operations, Air traffic management/Air navigation services, Standardised European Rules of the Air (SERA)

Activitytype: Aerodrome flight information services (AFIS), Aeronautical information services (AIS), Air navigation services (ANS), Air operations, Air traffic control services (ATC), Air traffic services (ATS), Flight information services (FIS), Meteorological services (MET), Safety Management system (SMS), Notification of differences to ICAO

Applicabilitydate: 1 May, 2025

Entryintoforcedate: 1 May, 2024

Icaoreference: Annex 10, Volume II

Regulatedentity: Aerodrome operator, Aeronautical station, Air navigation service provider, Air traffic controller, ATC provider, Air traffic services unit, Aircraft operator, Airspace user, Competent authority, EASA, European Commission, Flight crew, Member State, Unmanned free balloon operator

Regulatorysource: Regulation (EU) 2024/404 Navigate

Regulatorysubject: Annex-Section 14: Voice communications procedures

Typeofcontent: IR (Implementing rule)

Origin: EASA

Category: EAR

SERA.14035 Transmission of numbers in radiotelephony

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