Class B airspace
E49550
Class B airspace is a highly controlled airspace surrounding the nation’s busiest airports, designed to manage dense traffic with strict entry and communication requirements for pilots.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
United States airspace class
→
controlled airspace classification → |
| allows |
IFR operations
→
VFR operations with ATC clearance → |
| associatedWith |
Class B primary airport control tower
→
radar approach control facility → |
| centeredOn |
primary Class B airport
→
|
| chartedOn |
VFR terminal area charts
→
sectional aeronautical charts → |
| composedOf |
multiple concentric shelves
→
|
| definedBy |
Federal Aviation Administration
→
|
| designedFor |
high‑performance aircraft
→
large air carrier operations → |
| existsIn |
National Airspace System of the United States
→
|
| governedBy |
Title 14 CFR Part 71
→
Title 14 CFR Part 91 → |
| hasAbbreviation |
Class B
→
|
| hasCeiling |
varies by airport
→
|
| hasEntryRequirement |
aircraft must be equipped for IFR or VFR with required radios and transponder
→
|
| hasLowerFloor |
varies by sector
→
|
| hasMinimumWeatherRequirements |
3 statute miles visibility
→
clear of clouds → |
| hasNoiseConsiderations |
often subject to noise abatement procedures
→
|
| hasPrimaryPurpose |
management of high‑density air traffic
→
|
| hasShape |
upside‑down wedding cake
→
|
| hasSpecialVFRRules |
Special VFR operations require at least instrument rating for pilots at some Class B airports
→
|
| hasSpeedLimit |
200 knots indicated airspeed in underlying VFR corridors or within 4 NM of primary airport at or below 2,500 feet AGL
→
250 knots indicated airspeed below 10,000 feet MSL → |
| hasTypicalLowerLimit |
surface at primary airport
→
|
| hasTypicalUpperLimit |
10,000 feet MSL
→
|
| hasVerticalLimit |
surface to typically 10,000 feet MSL
→
|
| isLessRestrictiveThan |
Class A airspace
→
|
| isMoreRestrictiveThan |
Class C airspace
→
Class D airspace → |
| protects |
arrival and departure corridors
→
|
| provides |
sequencing for all aircraft to primary airport
→
traffic separation between IFR and VFR aircraft → |
| relatedTo |
ICAO Class C and D concepts but defined differently in the U.S. system
→
|
| requires |
ATC clearance prior to entry
→
Mode C transponder → operable altitude‑encoding equipment → pilot to receive explicit ATC authorization → student pilot endorsement for solo operations → two‑way radio communication with ATC → |
| requiresForEntry |
pilot to establish two‑way communication using correct facility call sign
→
|
| requiresForVFR |
ATC separation services from other aircraft
→
|
| subjectTo |
local letters of agreement and facility directives
→
|
| surrounds |
nation’s busiest airports
→
|
| uses |
solid blue lines on charts
→
|
Referenced by (3)
| Subject (surface form when different) | Predicate |
|---|---|
|
United States airspace
→
|
includes |
|
Class C airspace
→
|
isLessRestrictiveThan |
|
Class A airspace
→
|
relatedConcept |