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INSTRUMENT FLIGHT RULES WORKBOOK
CHAPTER EIGHT
3.
Altitudes up to but not including 18,000 feet MSL are spoken by stating the separate digits
of the thousands plus the hundreds. Examples:
12,000 --- ONE TWO THOUSAND
14,500 --- ONE FOUR THOUSAND FIVE HUNDRED
Altitudes at and above 18,000 feet MSL (FL 180) are spoken by stating the words "flight
level" followed by the first three digits of the altitude. Example:
FL 190 (ALT. 19,000) --- FLIGHT LEVEL ONE NINER ZERO
4.
Airway or jet route numbers are spoken:
V12 --- VICTOR TWELVE
V99 --- VICTOR NINETY- NINE
V455 -- VICTOR FOUR FIFTY-FIVE
J533 --- JET FIVE THIRTY-THREE
5.
All other numbers are transmitted by pronouncing each digit. Examples:
10 --- ONE ZERO
106 --- ONE ZERO SIX
6.
When a radio frequency contains a decimal point, the decimal point is spoken as "point."
Examples:
Frequency 255.4 --- TWO FIVE FIVE POINT FOUR
7.  The 24-hour clock system is used when transmitting time. The hour is indicated by the first
two figures and the minutes by the last two figures. Example:
0920 --- ZERO NINER TWO ZERO
1530 --- ONE FIVE THREE ZERO
Time may be stated in minutes only (two figures) when no misunderstanding as to the hour
is likely to occur.
8.  The directions of bearing, radial, course, or heading are spoken in three digits and should
always be magnetic. The word "true" must be added when it applies. Examples:
(magnetic course)
005 --- COURSE ZERO ZERO FIVE