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- 12,000 one two thousand 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- 190 Flight Level One Niner Zero 275 Flight Level Two Seven Five