12/31/20 AIM Section 2. Radio Communications Phraseology  and Techniques 4-2-1. General 4-2-1 ............................................................ 4-2-2. Radio Technique 4-2-1 .................................................... 4-2-3. Contact Procedures 4-2-1 .................................................. 4-2-4. Aircraft Call Signs 4-2-3 ................................................... 4-2-5. Description of Interchange or Leased Aircraft 4-2-4 ........................... 4-2-6. Ground Station Call Signs 4-2-5 ............................................ 4-2-7. Phonetic Alphabet 4-2-5 ................................................... 4-2-8. Figures 4-2-6 ............................................................ 4-2-9. Altitudes and Flight Levels 4-2-6 ........................................... 4-2-10. Directions 4-2-6 ......................................................... 4-2-11. Speeds 4-2-6 ............................................................ 4-2-12. Time 4-2-6 ............................................................. 4-2-13. Communications with Tower when Aircraft Transmitter or Receiver or Both are Inoperative 4-2-7 ....................................................... 4-2-14. Communications for VFR Flights 4-2-8 ..................................... Paragraph Page 4-1-23. Weather System Processor 4-1-19 ........................................... Section 3. Airport Operations 4-3-1. General 4-3-1 ............................................................ 4-3-2. Airports with an Operating Control Tower 4-3-1 .............................. 4-3-3. Traffic Patterns 4-3-2 ..................................................... 4-3-4. Visual Indicators at Airports Without an Operating Control Tower 4-3-7 .......... 4-3-5. Unexpected Maneuvers in the Airport Traffic Pattern 4-3-7 ..................... 4-3-6. Use of Runways/Declared Distances 4-3-8 .................................... 4-3-7. Low Level Wind Shear/Microburst Detection Systems 4-3-13 .................... 4-3-8. Braking Action Reports and Advisories 4-3-13 ................................. 4-3-9. Runway Condition Reports 4-3-14 ........................................... 4-3-10. Intersection Takeoffs 4-3-16 ............................................... 4-3-11. Pilot Responsibilities When Conducting Land and Hold Short Operations  (LAHSO) 4-3-16 ......................................................... 4-3-12. Low Approach 4-3-19 ..................................................... 4-3-13. Traffic Control Light Signals 4-3-19 ......................................... 4-3-14. Communications 4-3-20 ................................................... 4-3-15. Gate Holding Due to Departure Delays 4-3-21 ............................... 4-3-16. VFR Flights in Terminal Areas 4-3-21 ....................................... 4-3-17. VFR Helicopter Operations at Controlled Airports 4-3-21 ...................... 4-3-18. Taxiing 4-3-23 ........................................................... 4-3-19. Taxi During Low Visibility 4-3-24 ........................................... 4-3-20. Exiting the Runway After Landing 4-3-25 .................................... 4-3-21. Practice Instrument Approaches 4-3-25 ...................................... 4-3-22. Option Approach 4-3-26 .................................................. 4-3-23. Use of Aircraft Lights 4-3-27 ............................................... 4-3-24. Flight Inspection/`Flight Check' Aircraft in Terminal Areas 4-3-28 ............... 4-3-25. Hand Signals 4-3-28 ...................................................... 4-3-26. Operations at Uncontrolled Airports With Automated Surface  Observing System (ASOS)/Automated Weather Observing System (AWOS) 4-3-32 iv Table of Contents