4-2-8. Figures
a. Figures indicating hundreds and thousands in round number, as for ceiling heights, and upper wind levels
up to 9,900 must be spoken in accordance with the following.
EXAMPLE-
1. 500 five hundred
2. 4,500 four thousand five hundred
b. Numbers above 9,900 must be spoken by separating the digits preceding the word "thousand."
EXAMPLE-
1. 10,000 . one zero thousand
2. 13,500 . one three thousand five hundred
c. Transmit airway or jet route numbers as follows.
EXAMPLE-
1. V12 . Victor Twelve
2. J533 . J Five Thirty-Three
d. All other numbers must be transmitted by pronouncing each digit.
EXAMPLE-
10 . one zero
e. When a radio frequency contains a decimal point, the decimal point is spoken as "POINT."
EXAMPLE-
122.1 . one two two point one
NOTE-
ICAO procedures require the decimal point be spoken as "DECIMAL." The FAA will honor such usage by military aircraft
and all other aircraft required to use ICAO procedures.
4-2-9. Altitudes and Flight Levels
a. Up to but not including 18,000 feet MSL, state the separate digits of the thousands plus the hundreds if
appropriate.
EXAMPLE-
1. 12,000 . one two thousand
2. 12,500 . one two thousand five hundred
b. At and above 18,000 feet MSL (FL 180), state the words "flight level" followed by the separate digits of
the flight level.
EXAMPLE-
1. 190 Flight Level One Niner Zero
2. 275 Flight Level Two Seven Five
4-2-10. Directions
The three digits of bearing, course, heading, or wind direction should always be magnetic. The word "true" must
be added when it applies.
EXAMPLE-
1. (Magnetic course) 005 zero zero five
2. (True course) 050 zero five zero true
3. (Magnetic bearing) 360 . three six zero
4. (Magnetic heading) 100 . heading one zero zero
Radio Communications Phraseology
4-2-7