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If the atmospheric pressure at an
airfield is 1,000 millibars (mb) and this
pressure is set on the sub-scale of an
aircraft altimeter, then when that aircraft
touches down at the airfield, the
altimeter will read zero.
zero-zero zero-zero /zərəυ zərəυ/ adjective
referring to flying conditions of thick,
low cloud when a pilot can see nothing
ahead and nothing above or below the
aircraft
zonal zonal /zəυn(ə)l/ adjective referring to
one of the five parts into which the
Earth’s surface is divided by imaginary
lines parallel to the equator
The circulation
of air around the Earth is zonal in
character.
zone zone /zəυn/ noun 1. an area with particular
features or purpose 2. an administrative
area of airspace
control zone

aerodrome traffic zone (ATZ) 3. one of
five divisions into which the Earth’s
surface is divided by imaginary lines
parallel to the equator
temperate zone

climatic zone
zoom zoom /zum/ verb to make an aircraft
climb rapidly at a very steep angle, or
move upwards in this way
Zulu time Zulu time /zulu tam/ noun 
Greenwich Mean Time
SUPPLEMENTS
The Phonetic Alphabet
Standard words and phrases used in pilot communications
Aircraft registration codes
Airline codes
Airport codes
Local times around the world
International dialling codes
Standard symbols and abbreviations
Weights and measures
Conversion factors
The Phonetic Alphabet
Certain letters of the alphabet sound very similar, especially when a person is
talking on the telephone or radio. The phonetic alphabet is designed to prevent
confusion, by using a distinctive word to represent each letter.
Aa Alpha*
lfə
Bb Bravo
brɑ vəυ
Cc Charlie
tʃɑ li
Dd Delta
deltə
Ee Echo
ekəυ
Ff Foxtrot
fɒkstrɒt
Gg Golf ɒlf
Hh Hotel həυ
tel
Ii India
ndiə
Jj Juliet du li
et
Kk Kilo
ki ləυ
Ll Lima
li mə
Mm Mike mak
Nn November nə
vembə
Oo Oscar
ɒskə
Pp Papa
ppə
Qq Quebec kw
bek
Rr Romeo
rəυmiəυ
Ss Sierra si
erə
Tt Tango
tnəυ
Uu Uniform
ju nfɔ m
Vv Victor
vktə
Ww Whisky**
wski
Xx X-Ray
eksre
Yy Yankee
jŋki
Zz Zulu
zu lu 
* Alfa in US English
** Whiskey in US English
Standard words and phrases
Word/Phrase Meaning
Acknowledge Let me know that you have received and understood this
message.
Affirm Yes
Approved I give you permission for what you asked.
Cancel Cancel the last clearance I gave to you.
Check Examine a system or procedure.
Cleared I give permission for you to continue, bearing in mind
the conditions already given.
Confirm Have I correctly received the following … ? or Did you
correctly receive this message ?
Contact Contact by radio …
Correct That is correct.
Correction An error was made in the last transmission. What
follows is correct.
Disregard Assume that the last transmission was not sent.
How do you read? Tell me how good this transmission is on a 1 to 5 scale
where 1 = unreadable (cannot understand) to
5 = excellent reception (no difficulty in understanding).
I say again I am repeating in order to make my meaning very clear.
Over My transmission is finished and I want a response from
you.
Out This exchange of transmissions is finished. I do not want
a response from you.
Pass your message Proceed with your message.
Read back Repeat all, or the specified part of this message back to
me exactly as received.
Request I want to know or I want to have.
Roger I have received all of your last transmission.
Say again Repeat all, or the following part of your last
transmission.
Speak slower Speak more slowly.
Standby Wait and I will call you.
Verify Check and confirm with me.
Wilco I understand your message and will comply with it.
Words Twice (as a request) Communication is difficult. Please send
every word or group of words twice.
(as information) Because communication is difficult,
every word or group of words in this message will be
sent twice.
Aircraft registration codes
These codes are painted on all aircraft, showing their country of registration.
　
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