Aviation numbers
In aviation, numbers are read in a standardised way so that they are clearly understood over the radio, regardless of accent or interference. In Europe, the rules for when to say each digit separately or in groups (hundreds/thousands) come from SERA (EU Regulation 923/2012). The pronunciation of digits 0-9 in English is defined by ICAO Doc 9432 (Manual of Radiotelephony). Below you will find both the Polish way (used in domestic radio) and the ICAO English way (used internationally and in Poland for international traffic).
Reading numbers in Polish
Digits 0-9 in Polish radio phraseology. “Jedynka” and “piątka” (-ka forms) are used when transmission quality is below very good.
| Digit | Say | Listen |
|---|---|---|
| 0 | zero | |
| 1 | jedynka | |
| 2 | dwa | |
| 3 | trzy | |
| 4 | cztery | |
| 5 | piątka | |
| 6 | sześć | |
| 7 | siedem | |
| 8 | osiem | |
| 9 | dziewięć |
When to use digit-by-digit
In Polish phraseology, digits are given one by one for headings, runway, QNH, frequency, transponder code, etc. Whole hundreds and thousands can be read as “tysiąc”, “sto” (e.g. 5200 → pięć tysięcy dwieście), in line with SERA. In international traffic, English ICAO phraseology is used.
Reading numbers in English (ICAO)
Digits 0-9 per ICAO Doc 9432.
| Digit | Say | Note | Listen |
|---|---|---|---|
| 0 | ZE-RO | - | |
| 1 | WUN | - | |
| 2 | TOO | - | |
| 3 | TREE | differs from “three” / “free” | |
| 4 | FOW-ER | differs from “for” | |
| 5 | FIFE | differs from “five” / “fire” | |
| 6 | SIX | - | |
| 7 | SEV-EN | - | |
| 8 | AIT | - | |
| 9 | NIN-ER | avoids confusion with “nein” |
SERA.14035 rules (summary)
Call signs, headings, runway, wind, flight levels, QNH, transponder: each digit separately. Exception: flight levels in whole hundreds (e.g. FL 100 → ONE HUNDRED). QNH 1000 hPa → ONE THOUSAND. Transponder whole thousands only → e.g. SEVEN THOUSAND. Other information: whole hundreds/thousands as HUNDRED/THOUSAND. Position by 12-hour clock: e.g. TEN O'CLOCK. Decimal: say DECIMAL. VHF channel: six digits (or four if last two are zero).
Sources
- SERA.14035 - Transmission of numbers in radiotelephony (Annex to Commission Implementing Regulation (EU) No 923/2012).
- ICAO Doc 9432 - Manual of Radiotelephony (4th ed., 2007).
- ULC President Guideline No. 4 of 31.03.2017 - publication of ICAO Doc 9432 requirements.
- Practice of Polish domestic radio and training materials (e.g. CalypteAviation, lotnictwocywilne.pl) for Polish forms (jedynka, piątka).