SkyDrill

Class B vertical extent

Remote Pilot (Part 107) practice question 16 of 21 on Airspace / Classification. ACS element UA.II.A.K1a · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONClass B airspace generally extends from the surface up to what altitude?

  1. A10,000 feet mean sea level (MSL)
  2. B4,000 feet above the airport elevation
  3. C18,000 feet MSL, the base of Class A
Show the answer and explanation

Correct answer: A. 10,000 feet mean sea level (MSL)

  • A — correct The Remote Pilot Study Guide states that Class B airspace is generally airspace from the surface to 10,000 feet MSL surrounding the nation's busiest airports.
  • B — incorrect 4,000 feet above the airport elevation is the general upper limit of Class C airspace, not Class B.
  • C — incorrect 18,000 feet MSL is where Class A airspace begins and is the typical upper limit of Class E; Class B generally tops out at 10,000 feet MSL.

BACKGROUND

Class B airspace surrounds the nation's busiest airports in terms of airport operations or passenger enplanements. It generally extends from the surface to 10,000 feet mean sea level (MSL). The exact shape of each Class B area is individually tailored to contain all published instrument procedures once an aircraft enters the airspace. A remote pilot must receive authorization from Air Traffic Control (ATC) before operating in Class B airspace.

STUDY TIP

Memorize the general vertical limits of each class: Class B to 10,000 feet MSL, Class C to 4,000 feet above the airport, Class D to 2,500 feet above the airport.

KEY POINTS

  • Class B generally runs from the surface to 10,000 feet MSL.
  • It surrounds the busiest airports by operations or enplanements.
  • ATC authorization is required before a remote pilot operates in Class B.

SOURCES

  • remote_pilot_study_guide.txt Chapter 2 "Class B Airspace"
Practice the Remote Pilot (Part 107) test →Timed 60-question exam, by ACS area, or review your misses. Free.
MORE ON AIRSPACE / CLASSIFICATION

SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.