Important innovations and structure of the notice
The changes relate to the entire range of radiotelephony procedures and include, among other things
- Standardisation of the definitions in accordance with EU regulations.
- Standardisation of the pronunciation of numbers and call signs.
- Introduction of new procedures for special situations such as emergency and urgent transport.
The notice is divided into 35 Chapterwhich contain detailed information on all aspects of radiotelephony communication. Here are some of the most important points:
1. standardised definitions of terms (Article 2 of EU Regulation No 923/2012)
The terms and procedures used are based on the European Standards for Aviation Rules (SERA). This ensures better comprehensibility and standardisation within the EU.
2. dealing with numbers and pronunciation (SERA.14040)
The pronunciation of numbers plays a central role in aviation communication. The new specifications specify:
- Each number is pronounced individually, e.g. FL 180 as "Flight Level One Eight Zero" or 993 hPa as "QNH Niner Niner Three".
- Transponder codes with thousand digits are announced specifically, e.g. 2400 as "Squawk Two Four Zero Zero".
- Decimal numbers, such as frequencies, must be transmitted clearly with "decimal" (or "comma"), e.g. 118.025 as "One One Eight Decimal Zero Two Five".
3. procedure for transmission (SERA.14045)
New regulations ensure that transmissions are precise and efficient:
- Idioms such as "ACKNOWLEDGE" or "ROGER" are standardised.
- The term "Take-Off" may only be used when a take-off clearance is issued or cancelled.
4. call signs of aircraft (SERA.14050)
Callsigns are clearly defined and standardised:
- Complete callsigns: These consist of the registration mark of the aircraft or a combination of operator designation and flight number.
- Abbreviated callsigns: They may only be used if there is no risk of confusion.
5. emergency and urgency procedures (SERA.14095 and SERA.10005)
Specific procedures and phrases have been introduced for emergency and urgent transport. For example, the following terms must be used correctly:
- "MAYDAY" for emergencies.
- "PAN PAN" for urgent but not life-threatening situations.
6. new regulations on the pronunciation and structure of notifications
The regulations include precise requirements for specific notifications:
- Wind data: Z. E.g. "Wind Two Zero Zero Degrees Seven Zero Knots".
- Piste visibility: Z. E.g. "RVR One Thousand Seven Hundred".
- Flight altitudes: Z. E.g. "Two Thousand Two Hundred".
7. advanced phonetics for communication
The pronunciation of letters and numbers has been clarified to avoid misunderstandings:
- Figures like 7 (Seven) are recognised as "Sew-en" spoken.
- The letter "Z" is called "Zulu" labelled.
8. special procedures for evasive manoeuvres (SERA.11014 c)
The rules for behaviour at ACAS avoidance recommendations (Airborne Collision Avoidance System) have been expanded. Pilots must ensure that evasive manoeuvres are communicated precisely in order to avoid conflicts.
Significance of the changes
The aim of these new regulations is to
- More secure communication: Precise and standardised terms reduce misunderstandings.
- European harmonisation: Harmonised standards promote cross-border cooperation.
- Efficiency in radio communication: Shorter and clearer transmissions save time and resources.
Conclusion: Uniform standards for greater safety
The innovations in radiotelephony procedures strengthen safety and efficiency in aviation communication. Pilots and air traffic controllers benefit from clearly defined and standardised procedures that minimise misunderstandings and facilitate cooperation. The changes come into force on 28 November 2024 and mark a further step towards the harmonisation of European aviation.
Source references:
NFL (the link requires a subscription to Eisenschmidt)