CPC Airspace Classification & Structure 1 — Questions and Answers
Question 1: Which airspace class requires ATC clearance for all aircraft, both IFR and VFR?
- Class A (Correct answer)
- Class B
- Class C
- Class D
Correct answer: Class A
Class A airspace, from 18,000 feet MSL to FL600, requires ATC clearance and IFR flight rules for all aircraft.
Question 2: What is the vertical limit of Class A airspace in the contiguous United States?
- 12,500 ft MSL to FL180
- 18,000 ft MSL to FL600 (Correct answer)
- 14,500 ft MSL to FL450
- 10,000 ft MSL to FL550
Correct answer: 18,000 ft MSL to FL600
Class A airspace extends from 18,000 feet MSL up to and including FL600 over the contiguous US.
Question 3: Class B airspace is typically associated with which type of airport?
- Small regional airports
- Military airfields
- Busiest commercial service airports (Correct answer)
- Private landing strips
Correct answer: Busiest commercial service airports
Class B airspace surrounds the nation's busiest commercial service airports and requires ATC clearance for all operations.
Question 4: What communication requirement exists for aircraft operating in Class D airspace?
- Two-way radio contact before entering (Correct answer)
- Transponder with altitude encoding
- ATC clearance required
- VFR flight plan required
Correct answer: Two-way radio contact before entering
Aircraft must establish two-way radio communication with ATC before entering Class D airspace.
Question 5: What is the upper limit of Class G (uncontrolled) airspace when it underlies Class E airspace that begins at 1,200 ft AGL?
- 700 ft AGL
- 1,200 ft AGL (Correct answer)
- 3,000 ft AGL
- 14,500 ft MSL
Correct answer: 1,200 ft AGL
Class G airspace extends from the surface up to but not including the base of overlying Class E airspace, in this case 1,200 ft AGL.
Question 6: Which airspace class uses a Mode C transponder as a requirement for VFR aircraft operating above 10,000 ft MSL?
- Class A only
- Class B and above
- Class E and above
- All airspace above 10,000 ft MSL (Correct answer)
Correct answer: All airspace above 10,000 ft MSL
FAR 91.215 requires a transponder with altitude reporting (Mode C) for all aircraft operating above 10,000 ft MSL MSL, excluding Class A.
CPC Airspace Classification & Structure 1
Which airspace class requires ATC clearance for all aircraft, both IFR and VFR?