Chapter 4. In‐Flight Services

1. Section 1. General
   • 4-1-1. DESCRIPTION
   • 4-1-2. PRE‐DUTY REQUIREMENTS
   • 4-1-3. OPERATIONAL PRIORITY
   • 4-1-4. IN‐FLIGHT WEATHER BRIEFINGS
   • 4-1-5. AIRCRAFT‐REPORTED NAVIGATIONAL EQUIPMENT MALFUNCTIONS
   • 4-1-6. RECORDING IN‐FLIGHT INFORMATION
   • 4-1-7. FLIGHT PROGRESS STRIPS AND ENTRY DATA
2. Section 2. Radio Communications
   • 4-2-1. FREQUENCY USE
   • 4-2-2. AUTHORIZED TRANSMISSIONS
   • 4-2-3. RADIO MESSAGE FORMAT
   • 4-2-4. ABBREVIATED TRANSMISSION
   • 4-2-5. ROUTINE RADIO CONTACTS
   • 4-2-6. RADIO COMMUNICATIONS TRANSFER
   • 4-2-7. ATC CLEARANCES, ADVISORIES, OR REQUESTS
   • 4-2-8. DEPARTURE REPORTS
   • 4-2-9. IFR FLIGHT PROGRESS REPORTS
   • 4-2-10. ARRIVAL/MISSED APPROACH REPORTS
   • 4-2-11. NON‐DELIVERY OF MESSAGES
   • 4-2-12. BROADCAST (BLIND TRANSMISSION) OF MESSAGES
   • 4-2-13. UNAUTHORIZED ENTRY INTO CLASS A AIRSPACE OR PROHIBITED/RESTRICTED AREA
   • 4-2-14. NON‐EMERGENCY PARACHUTE JUMPING
3. Section 3. Advisory Services
   • 4-3-1. DESCRIPTION
   • 4-3-2. GENERAL
   • 4-3-3. ELEMENTS AND PHRASEOLOGY
   • 4-3-4. CHARTS
   • 4-3-5. AUTHORIZED FREQUENCIES
   • 4-3-6. TRAFFIC CONTROL
   • 4-3-7. AIRCRAFT EQUIPMENT CHECKS
4. Section 4. Automatic Flight Information Service (AFIS)
   • 4-4-1. GENERAL
   • 4-4-2. FORMAT
5. Section 5. Airport Lighting and Visibility Aids
   • 4-5-1. GENERAL
   • 4-5-2. AIRPORT LIGHTING
   • 4-5-3. CHANGING LIGHTED RUNWAYS
   • 4-5-4. VISIBILITY AIDS
   • 4-5-5. RVR
   • 4-5-6. OPERATION OF LANDING DIRECTION INDICATOR
6. Section 6. Special VFR Operations
   • 4-6-1. AUTHORIZATION
   • 4-6-2. REQUESTS FOR SPECIAL VFR CLEARANCE
   • 4-6-3. VISIBILITY BELOW ONE MILE
   • 4-6-4. PREDESIGNED SPECIAL VFR CLEARANCES