Mini Log BookThis Flight: n/aDay/Night: n/aTotal Flight Time: 2.3 hrsI was a little disappointed that today’s lesson wasn’t in the plane. It would have been a beautiful day to be up in the clear, cloudless sky with virtually unlimited visibility, but my instructor wanted to conduct some ground school today.
My disappointment soon turned to enthusiasm as my instructor taught me about classes of airspace and how to read sectional and terminal VFR (Visual Flight Rules) charts. Being able to read these charts is a veritable necessity if I ever want to go somewhere besides to/from the Schaumburg airport! It’s not really possible to know what class of airspace you’re in or going to be in if you can’t read a sectional or, worse yet, don’t have one. Whatever you do, you don’t want to fly into controlled airspace without following the proper procedures.
Class A airspace is everything from 18,000 feet through 60,000 feet and is restricted to IFR (Instrument Flight Rules) flight only. I’m intending to fly small planes such as the Cessna 172 which has a service ceiling of 14,000 feet according to the manufacturer, so flying high enough to worry about Class A probably isn’t something I’ll be doing any time soon, but it’s definitely good to know anyway. Since Class A is IFR only, there are no visibility restrictions for flying in it.
Class B airspace is depicted on sectional and terminal charts with solid blue lines and can cover a variety of altitudes. Think of “B” as “Busy” airspace – such as large international airports like O’Hare International. Inside the blue lines are numbers that look like fractions. For example, you might see 10/5. These numbers are the ceiling/floor for that airspace in hundreds of feet. So 100/50 means that the airspace begins at 5,000 feet and continues through 10,000 feet. In order to fly into Class B airspace, clearance from Air Traffic Control (ATC) is required. You also need to hold a private pilot certificate or be a student pilot with an endorsement from a CFI (Certified Flight Instructor). In addition you must have a working 2-way radio and a Mode C transponder. (A transponder enhances your aircraft’s ATC radar image. Mode C means that the transponder transmits your altitude.) Class B airspace can be flown either IFR or VFR, but VFR requires visibility to 3 statute miles.
Class C airspace is shown on sectional and terminal charts with solid magenta lines and, like class B, can cover a variety of altitudes. On the charts, reading Class C airspace works the same as reading Class B airspace. In order to fly into Class C airspace, you must be at least a student pilot and you need to have contact with ATC. Like Class B, you also need a two-way radio and a mode C transponder. Class C airspace can be flown under IFR or VFR, but VFR requires 3 statute miles visibility and you must avoid flying into clouds – 1,000 feet above, 500 feet below, or 2000 feet to the side of any clouds.
Class D airspace is shown on sectional and terminal charts with a dashed blue line. The floor of class D airspace is ground surface and the ceiling is shown hundreds of feet in a single square box. For example, you might see “32” in a square box inside a Class D area. That means the airspace starts at the surface (SFC) and extends to 3,200 feet. Class D airspace can be flown under IFR or VFR. You also must be at least a student pilot with a 2-way radio and ATC contact, but a transponder is not required. If you’re flying VFR, Class D airspace has the same visibility and cloud restrictions as Class C.
Class E airspace extends from the top of Class G airspace (don’t worry, that’s next) to 18,000 feet. There are no depictions on sectional or terminal charts for Class E. Class E airspace can be flown under IFR or VFR, but there are no requirements of you or your equipment. Neither a 2-way radio nor a transponder are needed. (Think hang-glider, sky-diver, etc.) Of course, if you are flying an airplane, it is incumbent on you to avoid hitting the afore mentioned hang-gliders and sky-divers. For VFR, Class E airspace has different visibility restrictions depending on your altitude. Above 10,000 feet, you need 5 statute miles visibility and need to need to fly 1,000 feet above, 1,000 feet below, or 1 mile to the side of any clouds. Below 10,000 feet, you need 3 statute miles visibility and you need to fly 1,000 feet above, 500 feet below, or 2,000 feet to the side of any clouds.
My summary of Class G airspace is skewed towards folks, such as myself, east of the Rocky Mountains. In particular, I’m mostly concerned with the greater Chicago-land area where I’m learning to fly. In and around the Rocky Mountains, you guys have some rules that hurt my head when I think about them.
That being said, Class G airspace may or may not be depicted on sectional and terminal charts by an area bounded by a wide, gradient line. Inside the gradient lines, the ceiling for Class G is 700 feet AGL (above ground level). Outside the gradient, the ceiling is 1,200 feet AGL. Class G can be flown under IFR or VFR and there are no requirements of you or your equipment. There are, however, different visibility requirements for VFR flights depending on your altitude and the time of day that you’re flying.
· 1,200 feet AGL or less: Day requires 1 statute mile visibility and flight clear of clouds. Night requires 3 statute miles visibility and you need to avoid clouds with 1,000 feet above, 500 feet below, or 2,000 feet horizontally.
· Above 1200 AGL, but less than 10,000 MSL: Day requires 1 statute mile visibility. Night requires 3 statute miles visibility. Both day and night require you to avoid clouds by 1,000 feet above, 500 feet below, or 2,000 feet horizontally.
· More than 1200 feet AGL and at or above 10,000 MSL: Day or night requires 5 statute mile visibility and you need to avoid clouds by 1,000 feet above, 1,000 feet below, or 1 statute mile horizontally.
In purely practical terms, east of the Rocky Mountains, there is no Class G airspace above 1,200 feet AGL. Above 1,200 feet AGL would be Class E.
We didn’t cover everything that is shown on sectional and terminal area charts, but by the time we muddled through all the airspaces, equipment and visibility requirements, and altitudes – especially the Class G stuff above, my brain was starting to turn to mush anyway. I just need some time to digest it all, re-review it, and let it all sink in.