Class C airspace
E49616
Class C airspace is a category of controlled airspace around busy airports that requires two-way radio communication and air traffic control clearance for participating aircraft.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
airspace classification
→
controlled airspace → |
| appliesTo |
IFR aircraft
→
VFR aircraft → |
| associatedWith |
primary airport with operational control tower
→
radar approach control facility → |
| chartDepiction |
solid magenta line
→
|
| definedBy |
Federal Aviation Administration
→
|
| doesNotRequire |
explicit ATC clearance phraseology for VFR entry once two-way communication is established
→
|
| exampleAirportType |
airports with scheduled passenger service and significant operations
→
|
| governedBy |
14 CFR Part 71
→
|
| hasLateralStructure |
core surface area radius of 5 nautical miles
→
shelf area radius of 10 nautical miles → |
| hasPrimaryPurpose |
enhance safety and efficiency of airport operations
→
separate IFR traffic from VFR traffic near busy airports → |
| hasVerticalStructure |
core surface area from surface to 4,000 feet above airport elevation
→
shelf area typically from 1,200 feet to 4,000 feet above airport elevation → |
| hasWeatherMinimums |
3 statute miles flight visibility
→
cloud clearance 500 feet below, 1,000 feet above, 2,000 feet horizontal → |
| implementedIn |
many medium-sized U.S. airports
→
|
| isLessRestrictiveThan |
Class B airspace
→
|
| isMoreRestrictiveThan |
Class D airspace
→
|
| mayInclude |
outer area for radar services
→
|
| outerAreaRadius |
typically 20 nautical miles
→
|
| provides |
conflict resolution advisories
→
radar services to IFR and VFR aircraft → safety alerts → sequencing to the primary airport → traffic advisories → |
| requires |
Mode C transponder
→
air traffic control clearance for entry → establishment of two-way communication with ATC → operable two-way radio → two-way radio communication → |
| requiresAircraftEquipment |
altitude-reporting transponder
→
two-way radio capable of communicating with ATC → |
| requiresEntryCondition |
two-way communication established when ATC states aircraft call sign
→
|
| requiresPilotAction |
comply with ATC instructions
→
contact approach control before entering → maintain listening watch on assigned frequency → |
| requiresTransponder |
within 10 nautical miles of primary airport at or above 10,000 feet MSL if within Mode C veil of nearby Class B
→
within and above Class C airspace → |
| surrounds |
airports with moderate traffic levels
→
airports with radar approach control → busy airports → |
| symbolizedOn |
VFR sectional charts
→
|
| trafficLevel |
moderate traffic density
→
|
| usedIn |
United States National Airspace System
→
|
Referenced by (4)
| Subject (surface form when different) | Predicate |
|---|---|
|
National Airspace System
→
|
hasComponent |
|
United States airspace
→
|
includes |
|
Class B airspace
→
|
isMoreRestrictiveThan |
|
Class A airspace
→
|
relatedConcept |