INSTRUMENT FLIGHT RULES WORKBOOK
802. RADIO COMMUNICATION PHRASEOLOGY AND TECHNIQUES
Radio communications are a critical link in the ATC system. Aviators must have a sense of
whom they are communicating with, what information is required by particular controllers, and
how best to convey intentions and/or requests. This lesson topic provides an introduction to
ATC facilities and the procedures used to communicate with them.
Flight Information Handbook
IFR Enroute Supplement United States
To fly safely in the IFR environment, knowledge of standard radio phraseology, voice report
formats, and an understanding of lost communications and holding procedures is essential.
The single most important consideration in pilot-controller communications is understanding.
Brevity is important and contacts should be kept as brief as possible, but the controller must
know what you want to do before he can properly carry out his control duties and you, the pilot,
must know exactly what he wants you to do. Specific phraseology has been established for
routine messages between controllers and pilots to standardize, expedite, simplify, and promote
understanding. However, concise phraseology may not always be adequate. Use whatever
words are necessary to get your message across.
Numbers are standard except the digits 0 and 9.
0 is spoken - ZERO and
9 is spoken - NINER (to lessen the confusion between nine and five)
2. Numbers indicating hundreds and thousands in round numbers (ceiling heights and upper
wind levels) up to 9900 are spoken as:
500 --- FIVE HUNDRED
4500 --- FOUR THOUSAND FIVE HUNDRED
9900 --- NINER THOUSAND NINER HUNDRED
Numbers above 9900 shall be spoken by separating the digits preceding the word "thousand."
10,000 --- ONE ZERO THOUSAND
13,500 --- ONE THREE THOUSAND FIVE HUNDRED
8-4 INTRODUCTION TO GROUND, AIRBORNE, LOST COMMUNICATION, AND
EMERGENCY VOICE PROCEDURES