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callsign Pronunciation | Learning Zone

An aircraft call sign is a group of alphanumeric characters used to identify an aircraft in air-ground communications.



Pilot controller communication

"When controllers and pilots better


Automatic terminal information service, or ATIS, is a continuous broadcast of recorded aeronautical information in busier terminal areas, i.e. airports and their immediate


This incident involves China Eastern unknowingly transmitting blind, (possibly by accidentally keying the mic) and being unable to receive transmissions from TWR.  

Notice how China


The use of similar call signs by aircraft operating in the same area and especially on the same RTF frequency often causes potential and actual flight safety incidents. This hazard is usually


Advice about improving your English and passing an ICAO English test from Aviation English Asia.
Article written/adapted by



pronunciation-logo Pronunciation | Learning Zone

In this section of Learning Zone we focus on pronunciation in Aviation English. As ICAO advises, "pronunciation must be given high priority."  Pronunciation is a fundamental part of language learning and allows the speaker to express themselves coherently and accurately. 

In this article by Aviation English Asia Ltd you are going to learn about the pronunciation of 's' as the final sound of verbs in third person and plural nouns.  The ending 's' is pronounced /s/ after a voiceless sound, pronounced /z/ after a voiced sound and  pronounced /ɪz / or /əz/ after a sibilant sound.  But what does this mean?  Read on to find out.

Third person verbs

The correct use and pronunciation of verbs in third person is classified as a Basic Structure in the AEROSTA Framework and ICAO Document 9835.  It is a area of language in which pronunciation overlaps with structure, and it is most likely that it is used when describing facts, eg scientific principles, habits and timetables.  Pronunciation errors such as these are cumulative, and in combination with other errors can cause communication difficulties.

Plural nouns 

The same rules of pronunciation of 's' also apply to plural nouns. But be aware that there are a number of exceptions, most frequent of all "debris" which is a French word and actually has a silent 's'.

Debris on the runway

Basic concepts of pronunciation

The pronunciation of final 's' depends on the last sound of the word.  If you read our introductory article Terms and concepts used in English pronunciation you will be aware of the difference between voiced and unvoiced consonants, as well as sibilant sounds.  As a quick recap,

  • a voiced consonant is one that that requires effort from the vocal chords (a vibration or humming sound).  For example, if you put two fingers on your throat and make the W sound you will feel a vibration.  That vibration means that it is a voiced sound.
  • an unvoiced sound is where there is no vibration in the throat and instead the sound comes from the mouth area. If you pronounce the letter P you will notice how it comes from your mouth not the throat.
  • a sibilant sound is produced by forcing air out toward your teeth. Is is characterized by a long hissing sound (sssss like a snalke), or a buzzing sound (zzzzz like a bee) at the end of words

The rules

The pronunciation of the final 's' in verbs in third person and plural words will depend on the final consonant sound (not the letter - letters in English often have a different pronunciation) before that 's'.  These are the rules for pronunciation, although there are a number of exceptions.

Sibilant: reduces, increases /sɪz / or /səz /, air-bridges /dʒɪz / or /dʒəz /, pushes /shɪz / or /shəz /
Voiced: crabs /bz/ -- birds /dz/ -- gloves /vz/, flows
Voiceless: helps /ps/ - rectracts /ts/ - looks /ks/ - cliffs /fs/ graphs /fs/

ICAO Aviation English Pronunciation of S

1. The /ɪz/ sound (or sometimes /əz/ sound) 

If the last consonant sound of the word is a sibilant sound (a hissing or buzzing sound), the final 's' is pronounced as /ɪz/. This /ɪz/ sound is pronounced like an extra syllable. (e.g. the word masses has two syllables)

If the sound has a J sound (/dʒ/ like the letter J at the beginning of the word juliet or /ʒ/ like the S in Asia), then the final 's' is also pronounced as /ɪz/.

Examples of words ending in the /ɪz/ sound:

CE: races (eg pronounced like "race-iz"), reverses, buses
S: pauses, rises
X: fixes, taxes, hoaxes
Z:, freezes, prizes, 
SS: kisses, misses, passes, bosses
CH: sandwiches, teaches
SH: wishes, pushes, crashes
GE: gauges, garages, changes, ages,

Remember: after verbs ending in -sh, -ch, -ss and -x, we add the -es to the end of the verb (in third person) and the pronunciation is /iz/ as an extra syllable.

2. The /s/ sound

If the last consonant of the word is unvoiced, then the 's' is pronounced as /s/. It does not require an extra syllable

NOTE: The consonants c, s, sh, ch and x are voiceless though they use the sibilants ending seen above.

Examples of words ending in the /s/ sound:

P: cups, stops, sleeps
T: hats, students, hits, writes
K: cooks, books, drinks, walks
KT: retracts, instruments (pronounced retracTs, not retracs)
F: cliffs, beliefs, laughs, graphs, (the -gh and -ph here are pronounced like a F)
TH: myths, tablecloths, months (voiceless th)

3. The /z/ sound

If the last letter of the words ends in a voiced consonant (or sound), then the S is pronounced like a /z/ (without creating another syllable). 

We also use this ending when the word ends in a vowel sound (e.g. bees, flies etc.)

Examples of words ending in the /z/ sound:

B: crabs, rubs
O: flows
E: trees
D: retards, reads, words, rides, ends
G: tugs, bags, 
L: deals, calls, falls, aerofoils 
M: climbs, dreams
N: fans, drains, runs, pens
NG: wings, belongs, sings
R: wears, cures
V: gloves, wives, shelves, drives
Y: plays, relays,
THE: clothes, bathes, breathes


Listen to the sentences in the audio below and identify the endings of the words. 


What to do next For more information about Aviation English Asia’s courses please visit or call +852 81799295. 
If you haven't already please join the Aviation English mailing list for special offers and details of courses in your area.

 Aviation English Pronunciation

English learning advice from Aviation English Asia Ltd

Pronunciation in air to ground communications is very different to pronunciation when talking to other people face to face.  As a learner of Aviation English it is important to realise that there is English, and there is phraseology in radiotelephony - with few overlaps between.  Pronunciation is a frequent area of failure in ICAO English Language Proficiency tests and one that is often neglected because it is difficult for a learner to identify that they have a specific problem.  Aviation English Asia Ltd teachers are qualified and experienced in diagnosing a wide range of language issues, and when feedback is given it is often done using very specific meta-language used by teachers.  In this article we introduce some of the terms and concepts used to identify areas of pronunciation.  Of course, pronunciation errors are cumulative and you may have more than one difficulty. We will briefly define the components of pronunciation from smallest unit of sound to those in a sentence. 


A phoneme is a unit of sound. Phonemes are expressed as phonetic symbols in the IPA (International Phonetic Alphabet). Some letters have one phoneme, others have two such as the diphthong 'ire' as in fire (AI - uh). Sometimes a phoneme may be a combination of two letters such as 'ch' in 'checklist', or 'fl' in 'flight'. 


There are twenty-six letters in the English alphabet. Some letters are pronounced differently depending on the letters preceding and following them. For example, 'c' can be pronounced like a hard /k/ in retract or as an /s/ in the verb 'practice'. Letters are made up of consonants and vowels. Consonants can be voiced or voiceless depending on the sound (or phoneme). The difference between voiced and voiceless is explained below.


Consonants are the sounds that interrupt vowel sounds. Consonants are combined with vowels to form a syllable. They include:

b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, z

Consonants can be voiced or unvoiced.


Vowels are open sounds caused with the vibration of vocal sounds, but without obstruction. Consonants interrupt vowels to form syllables. They include:

a, e, i, o, u and sometimes (at the end of a word) y 

All vowels are voiced as they are produced using the vocal chords.


A voiced consonant is a consonant that is produced with the help of the vocal chords. You can identify if a consonant is voiced by placing your fingers to your throat. If the consonant is voiced, you will feel a vibration. Understanding whether a consonant is voiced or unvoiced will have a massive impact on your ability to improve your pronunciation.

Voiced Consonant Sounds

b, d, g, j, l, m, n, r, v, w


A voiceless consonant is a consonant that is produced without the help of the vocal chords. Place your fingers on your throat when speaking an unvoiced consonant and you will only feel a rush of air through your throat. With some you can also feel the air escaping from your mouth.

Unvoiced Consonants

c, f, h, k, q, s, t, x

Minimal Pairs

Minimal pairs are pairs of words that differ in only one sound. For example: 'ship' and 'sheep' differ in only in the vowel sound. Minimal pairs are used to practice slight differences in sound.  Aviation English Asia Ltd teachers will identify the minimal pairs which are most relevant to you.


A syllable is formed by a consonant sound combining with a vowel sound. Words can have one or more syllables, and sometimes diphthongs which can often be confused with syllables. To test how many syllables a word has, put your hand under your chin and speak the word. Every time your jaw moves indicates another syllable.

Syllable Stress

Syllable stress refers to the syllable that receives the main stress in each word. Some two syllable words are stressed on the first syllable: pilot, checklist - other two syllable words are stressed on the second syllable: retract, return. There are a number of different word syllable stress patterns in English.  Sometimes it's useful to learn the rules, but for many learners it's easier to just learn the correct pronunciation of the word.

Tonic Stress

Tonic stress refers to which words are stressed in a sentence. We can divide these into content words and function words.  Usually, content words are spoken slower (it is a mistake to say that content words are spoken louder) and glide over function words.

Content Words

Content words are words that convey meaning and include nouns, main verbs, adjectives, adverbs and negatives. Content words are the focus of a sentence. Stress these content words to provide the rhythm of English by gliding, or skipping over the function words.  At least one word in a sentence carries the main meaning of the sentence and is called the tonic.

Function Words

Function words are words that required for the grammar, but that provide little or no content. They include auxiliary verbs, pronouns, prepositions, articles, etc. 

Stress-Timed Language

When speaking about English we say that the language is stress-timed. In other words, the rhythm of English is created by words stress, rather than syllable stress as in syllabic languages.

Word Groups

Word groups are groups of words that are commonly grouped together and before or after which we pause. Word groups are often indicated by commas such as in complex or compound sentences.

Rising Intonation

Rising intonation occurs when the voice goes up in pitch. For example, we use rising intonation at the end of yes / no questions. We also use rising intonation with lists, separating each item with a short rise in the voice, before a final, falling intonation for the last item in a list. For example in the instruction:

Cessna 345, contact Bay departure one two seven point zero.

'3', '4', '5', '1', '2', '7' and 'point' would rise in intonation, while 'zero' would fall. 

Falling Intonation

Falling intonation is used with information sentences and, in general, at the end of statements.


Reductions refers to the common practice of combing a number of words into a short unit. This generally occurs with function words. A few common reduction examples are: gonna -> going to / wanna -> want to.  It is generally regarded as bad practice to use reductions in radio communication.


Contractions are used when shortening the helping verb. In this way, two words such as 'is not' become one 'isn't' with only one vowel. 

What to do next

Aviation English Asia Ltd offer pronunciation activities in every course, and also in Supplementary Classes each weekend. For further details email This email address is being protected from spambots. You need JavaScript enabled to view it. or call +852 81799295.



Do you say /lunway/ instead of /runway/? Is this a problem? A guide to pronunciation in Aviation English.

English learning advice from Aviation English Asia.

Written by Michael McBride

In this article I am going to focus on pronunciation in Aviation English, the different characteristics and ICAO requirements. As the ICAO advises, "pronunciation must be given high priority." It must be stressed that your Aviation English training requires you to practice both listening and speaking, which form the main part of the ICAO tests, so pronunciation is essential. General components of pronunciation Pronunciation is of course a fundamental part of language learning and allows the speaker to express themselves coherently and accurately. You will have experienced the feeling of knowing the meaning of a word but if you cannot pronounce it properly you are left with feelings of inadequacy. If you can pronounce words how they should be you are given the confidence to keep on improving your language skills. Included in the general pronunciation umbrella are the following: -

  • Stress – The emphasis of words or parts of words (syllables), but also can include weak sounds
  • Rhythm – The speed of communication, including when to pause and when to speed up
  • Intonation – The high, middle and low levels of speech, especially noted in asking questions

In your General English training you should have knowledge and practice of these pronunciation areas, for example vowel and consonant sounds, knowing when to emphasise sounds/words and how to question by raising your voice higher or lower. ICAO Aviation English pronunciation requirements According to the ICAO, level 4 candidates must "use a dialect or accent which is intelligible to the community," in other words, pronunciatAviation English Pronunciationion is crucial. Let’s look at the word "intelligibility" as it a key part of Aviation English. This term is linked to how someone is understood and not necessarily that person being 100% correct all the time with how/what they say. Please do not mistake intelligibility with accuracy, although similar they are separate terms. This is especially relevant to ICAO Level 4. The other person must be able to understand you but you do have the space to make a few mistakes. As ICAO state: "Pronunciation, stress, rhythm and intonation….sometimes interfere with ease of understanding." (ICAO 9835) So to be more positive this means although pronunciation is "high priority" (ICAO) to get to operational level there is room to make some errors. If your voice is unclear, the words are not understandable and too many (instead of a few) mistakes are made how can the controller/pilot communicate with you effectively in the sky and on the ground? Advice on how to improve pronunciation To improve your pronunciation is all about being aware of your mouth and what sounds it produces within the English language. What sounds do your front mouth/lips make as opposed to the back of your throat? You may find it harder to pronounce ‘back of the throat’ sounds like "k" or "q", through knowing what are your weaknesses you can then focus on repeating these sounds until practice makes perfect. In order to be intelligible over the radio be aware that omitting key vowel and particularly consonant sounds can decrease all understanding. Not saying consonant sounds at the end of words is a particular problem with some learners. Do you say "requ vect" when it should be "request vectors?" Looking at the word "vectors" consider the following: -

  • "Vec-ors" – is this recognisable?
  • "Ve-tors" – how about this?

Linking to ICAO requirements it may be all right to accidentally omit consonants in the middle of words, but be careful and try to self-correct whenever possible. Strategies to self-correct and practice problem pronunciation will be taught in greater detail with your instructor at Aviation English Asia. You should have the ability to correct yourself, but don’t expect to be perfect or fluent at ICAO level 4. Further advice It is certainly advisable to listen to a range of accents and dialects, linked again to the ICAO requirements about being understood in an intelligible way of speaking. It is not enough to role model and listen to your teacher’s accent alone. What accents are must difficult for you to understand, what is your developing accent going to be? What works for you?

  • British English – this tends to include stronger pronunciation of consonants like "t", for example "often" is usually pronounced "offt-un"
  • American English – in comparison consonant sounds tend to sound weaker, "often" sounds like "off-un."

You certainly need to be aware of different accents and practice listening to them so you eventually are able to work out what the word is quickly and efficiently. Listen to authentic recordings on and our youtube channel.  Select an audio recording. Is every consonant sound like "t" and "l" pronounced? Why or why not? Listen to the speed of interaction. What differences can you hear with native and non-native English speakers? Checklist

  • Intelligibility, intelligibility, and intelligibility.
  • Try to be as accurate as possible but being understood is key
  • Listen to a variety of accents from real ATC recordings. What sounds do you find difficult to both speak and listen?
  • What to do next For more information about Aviation English Asia’s courses please visit If you haven't already please join the Aviation English mailing list for instant access to free demonstration units of the ICAO Aviation English Online course, special offers and details of courses in your area.

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