AR 95-1

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Airspace Review

• AR 95-1
• FM 1-240
• AIM

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Q. What are the lateral dimensions of Class A
Airspace?

• A. Class A airspace lies over the 48 contiguous
  states and Alaska, including airspace overlying
  waters within 12 NM of the coast.

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Q. What are the vertical dimensions of Class A
Airspace?

• A. Class A airspace vertical limits are 18,000
  feet MSL to FL 600. In Alaska, excludes airspace
  below 1500 AGL.

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Q. What type of flying operations are permitted
in Class A Airspace?

• A. Only IFR operations are permitted in Class A
  airspace. VFR is not permitted.

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Class A Airspace
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Q. What are the lateral dimensions of Class B
Airspace?

• A. The lateral boundaries of Class B airspace
  are individually tailored. There are no special
  dimensions. The airspace consists of at least 2
  layers (looks like an upside down wedding cake).

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Q. What are the vertical dimensions of Class B
Airspace?

• A. Class B airspace extends from the surface to
  generally 10,000 feet MSL. Each layer has its
  own defined vertical limit.

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Q. What are the minimum cloud and visibility
requirements within Class B Airspace?

• A. Minimum weather requirements for Class B
  Airspace are Distance from clouds Clear of
  Clouds.
• Minimum Visibility 3 SM

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Q. What are Class B Airspace communications
requirements?

• A. Must have positive ATC clearance prior to
  entry or departure from airspace. For IFR
  operations, must have VOR or TACAN.

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Q. What is the Class B Airspace transponder
requirement?

• A. Aircraft must have a transponder with Mode -
  C.

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Q. What is the Mode - C veil?

• A. The mode-C Veil is the airspace within 30 NM
  of the Class B airport in which a transponder
  with Mode-C is required. Active from surface to
  10,000 feet MSL. The Veil is denoted on VFR
  charts by a thin blue line.

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Q. How is Class B airspace charted on a VFR
sectional map?

• A. Class B airspace is charted on a VFR
  sectional by a series of blue circles.

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Class B Airspace
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Q. What are the lateral dimensions of Class C
Airspace?

• A. Class C airspace has 2 circles centered on
  the airport
• The inner circle has a radius of 5 NM
• The outer circle has a radius of 10 NM

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Q. What are the vertical dimensions of Class C
Airspace?

• A. The inner circle starts at the surface up to
  4000 Feet AGL
• The outer circle starts at 1200 Feet AGL up to
  4000 Feet AGL

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Q. What are the minimum cloud and visibility
requirements within Class C Airspace?

• A. Minimum weather requirements for Class C
  Airspace are
• Distance from clouds 500 Ft below, 1000 Ft
  above, 2000 Ft horizontally.
• Minimum Visibility 3 SM

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Q. What are Class C Airspace communications
requirements?

• A. You must establish communications with ATC
  prior to entry.

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Q. What is the Class C Airspace transponder
requirement?

• A. Aircraft must have a transponder with Mode -
  C within and above all Class C airspace, up to
  10,000 Ft MSL.

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Q. How is Class C airspace charted on a VFR
sectional map?

• A. Class C airspace is charted on a VFR
  sectional by two magenta circles.

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Class C Airspace
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Q. What is the outer area of Class C airspace?

• A. The outer area is not part of Class C
  airspace. The outer area has a radius of 20 NM
  from the airport. It starts at the lower limit
  of radio/radar coverage and goes up to the upper
  limit of Approach Controls delegated airspace.

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Q. What are the lateral dimensions of Class D
Airspace?

• A. Class D airspace is normally a 5 SM radius
  from the airport. Some airports may have
  extensions protruding from the circle.

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Q. What are the vertical dimensions of Class D
Airspace?

• A. Class D airspace extends from the surface up
  to 2500 Ft AGL.

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Q. What are the minimum cloud and visibility
requirements within Class D Airspace?

• A. Minimum weather requirements for Class D
  Airspace are
• Distance from clouds 500 Ft below, 1000 Ft
  above, 2000 Ft horizontally.
• Minimum Visibility 3 SM

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Q. What are Class D Airspace communications
requirements?

• A. You must establish communication with ATC
  prior to entering Class D airspace.

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Q. What is the Class D Airspace transponder
requirement?

• A. Class D airspace has no transponder
  requirement.

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Q. What are the extensions protruding from Class
D airspace?

• A. Extensions are used for instrument
  approaches. If the extension is 2 NM or less, it
  is Class D airspace. If any one extension is
  greater than 2 NM, then all of the extensions are
  Class E airspace.

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Q. How is Class D airspace charted on a VFR
sectional map?

• A. Class D airspace is charted on a VFR
  sectional by a blue dashed circle.

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Class D Airspace
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Q. What is the definition of Class E airspace?

• A. Class E airspace is all controlled airspace
  that is not classified as Class A, B, C, or D
  airspace

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Q. What are the minimum cloud and visibility
requirements within Class E Airspace?

• A. Minimum weather requirements for Class E
  Airspace are
• Below 10,000 Ft. MSL Distance from clouds 500
  Ft below, 1000 Ft above, 2000 Ft horizontally.
  Minimum Visibility 3 SM
• 10,000 Ft. MSL or Above Distance from clouds
  1000 Ft below, 1000 Ft above, 1 SM horizontally.
  Minimum Visibility
• 5 SM

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Q. How is Class E airspace, at non-towered
airports, charted on a VFR sectional map?

• A. Non-towered Class airports are charted on a
  VFR sectional by a dashed magenta lined circle.
  Extensions are charted with magenta dashed lines

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Surfaced-based Class E Airspace
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Q. What are Class E Airspace communications
requirements?

• A. There are no communications requirements to
  operate within Class E airspace

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Q. What is the Class E Airspace transponder
requirement?

• A. Class E airspace has no transponder
  requirement.

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Q. If there is no Class E airspace designated
otherwise, where does Class E airspace start?

• A. Unless designated at a lower altitude, Class
  E airspace begins at 14,500 Ft MSL up to 18,000
  MSL only over the 48 contiguous States and Alaska.

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Class E Airspace
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Q. What are Class E transition areas and what
altitudes do they start at?

• A. Class E airspace that is used to transition
  to/from the terminal or enroute environment is
  called a transition area.
• A fading magenta color on a VFR sectional denotes
  a transition area starting at 700 Ft AGL.
• A fading blue color on a VFR sectional denotes a
  transition area starting at 1200 Ft AGL.
  However, the blue color is not shown unless it
  abuts uncontrolled Class G airspace.

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Q. What type of airspace are Federal airways?
What are the vertical limits of Federal airways?

• A. Federal airways are Class E airspace. They
  start at 1200 Ft AGL up to but not including
  18,000 Ft MSL.

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Q. What is the width of a VOR airway?

• A. The width of a VOR airway is 8 NM, 4 NM
  either side of centerline. This is only true
  within 51 NM of the VOR. After 51 NM, the airway
  expands about 2 NM for every 13 NM increase in
  length.

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Victor Airway
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Q. What are TRSAs ?

• A. A terminal radar service area is airspace
  where a pilot can receive radar services to
  transition to/from the airport that has the TRSA.
  Pilot participation of the radar usage within a
  TRSA is voluntary, but highly encouraged.

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TRSA
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Q. What type of airspace is Class G?

• A. Class G airspace is uncontrolled airspace.

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Q. What are the Army VFR weather minimums in
Class G airspace at or below 1200 feet?

• A. Day Clear of CloudsVisibility-1/2 SM
• Night Clear of CloudsVisibility- 1 SM

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Q. What are the Army VFR weather minimums in
Class G airspace above 1200 feet?

• A. Less than 10,000 Ft MSL
• 500 Ft below, 1000 Ft above, 2000 Ft
  horizontalVisibility-1 SM Day/3 Night
• At or greater than 10,000 Ft MSL
• 1000 Ft below, 1000 Ft above, 1 SM
  horizontalVisibility-5 SM (Day Night)

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Q. IF planning an IFR flight through Class G
airspace, what are the altitude considerations?

• A. When planning through uncontrolled airspace,
  aircraft must remain 1000 Ft above the highest
  obstacle in flat terrain and 2000 Ft in
  mountainous terrain within 4 NM of the course to
  be flown.

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