In Class A airspace, which flight rules apply?

In Class A airspace, which flight rules apply?

• A. VFR is permitted with standard weather minimums.
• B. Class A permits both IFR and VFR with proper clearance.
• C. In Class A, two-way radio communications are optional.
• D. In Class A airspace, IFR only.

Answer: (D)

In Class A airspace, only IFR operations are allowed. This space is designed for high-altitude, instrument-based flight where ATC provides separation for all traffic, so pilots must be on an IFR flight plan and receive explicit ATC clearance before entering. VFR flights are not permitted there, regardless of weather, and two-way radio communications with ATC are required at all times. Aircraft entering Class A must be IFR-equipped and meet the IFR requirements, including an active IFR flight plan and a functioning transponder with altitude encoding. So, the description of IFR only is the correct one because it captures the essential rule: VFR operations are not allowed, and all flights must be conducted under IFR with ATC clearance and proper communication.

In Class A airspace, only IFR operations are allowed. This space is designed for high-altitude, instrument-based flight where ATC provides separation for all traffic, so pilots must be on an IFR flight plan and receive explicit ATC clearance before entering. VFR flights are not permitted there, regardless of weather, and two-way radio communications with ATC are required at all times. Aircraft entering Class A must be IFR-equipped and meet the IFR requirements, including an active IFR flight plan and a functioning transponder with altitude encoding.

So, the description of IFR only is the correct one because it captures the essential rule: VFR operations are not allowed, and all flights must be conducted under IFR with ATC clearance and proper communication.