Airspace

Question 1

What is Class A airspace?

Answer 1

Controlled airspace from 18,000 ft MSL to FL 600.

Question 2

What operations are allowed in Class A?

Answer 2

IFR only.

Question 3

What is required to enter Class A?

Answer 3

IFR clearance, two-way radio, Mode C transponder, ADS-B Out.

Question 4

Where is Class A located?

Answer 4

Contiguous U.S., Alaska, Hawaii, Designated international airspace, and within 12 NM offshore.

Question 5

What is Class B airspace?

Answer 5

Controlled airspace around the busiest airports with multiple layers.

Question 6

Typical dimensions of Class B?

Answer 6

Surface to 10,000 ft MSL (varies; individually tailored).

Question 7

What is required to enter Class B?

Answer 7

Explicit ATC clearance.

Question 8

What equipment is required in Class B?

Answer 8

Two-way radio, Mode C transponder, ADS-B Out.

Question 9

Are student pilots allowed in Class B?

Answer 9

Yes, with proper instructor endorsement.

Question 10

What is Class C airspace?

Answer 10

Controlled airspace around medium-traffic airports with radar and control towers.

Question 11

Typical Class C dimensions?

Answer 11

Surface to 4,000 ft AGL; 5 NM core; 10 NM shelf.

Question 12

Requirement to enter Class C?

Answer 12

Two-way radio communication (ATC must say your call sign).

Question 13

Equipment required for Class C?

Answer 13

Two-way radio, Mode C transponder, ADS-B Out.

Question 14

Services to VFR aircraft in Class C?

Answer 14

Sequencing, traffic advisories, basic radar service.

Question 15

What is Class D airspace?

Answer 15

Controlled airspace around airports with operational control towers.

Question 16

Typical Class D dimensions?

Answer 16

Surface to 2,500 ft AGL; 4–5 NM radius (varies).

Question 17

Requirement to enter Class D?

Answer 17

Two-way radio communication (ATC says your call sign).

Question 18

What happens when the class D tower closes?

Answer 18

Normally reverts to Class E or G (published in Chart Supplement).

Question 19

What is Class E airspace?

Answer 19

Controlled airspace not designated A–D; supports IFR procedures.

Question 20

Where does default Class E begin?

Answer 20

14,500 ft MSL unless otherwise designated.

Question 21

Where does default Class E extend to?

Answer 21

Up to, but not including, 18,000 ft MSL.

Question 22

Class E transition area altitudes?

Answer 22

700 ft AGL or 1,200 ft AGL.

Question 23

How is Class E surface area shown?

Answer 23

Dashed magenta lines.

Question 24

What is Class G airspace?

Answer 24

Uncontrolled airspace.

Question 25

Where is Class G found?

Answer 25

Surface up to the base of Class E (700 or 1,200 ft AGL typically).

Question 26

Is ATC clearance required in Class G?

Answer 26

No.

Question 27

Is any equipment required in Class G?

Answer 27

No specific equipment requirements, other than that in 91.205

Question 28

Is Class G controlled or uncontrolled?

Answer 28

Uncontrolled.