Airspace Question E vs G esp Houston

[huskerfan]

Hey all,
I was wondering if some of you could clarify some airspace questions I got. Where can you find class G airspace on a map? I've been told on the Houston Chart there is no class G, its all Class E from 1200AGL. That just baffles me cuase it seems to me if there isn't any magenta shading, blue shading or vor airways around it would be class G to 18000.

 

[Mitsipilot]

Let me get this straight, you are a CFI/CFII and you do no know this?

Well, class G exists below 1200' AGL on the Houston sectional. If there is a red transition area around the airport, then the class E is extended down to 700' AGL with class G below that. Look on the chart legend. There is a note that says that Class E airspace starts at 1200' unless otherwise noted.

Good luck...

 

[A Squared]

I think you'll find that Houston, like most other areas on the East Coast, doesn't have any Class G airspace above 1200 agl. You won't find any blue vingetting because it starts at 1200 feet everywhere except where it starts at 700 ft (magenta vingetting) THink about it fos a moment: where would you put the blue vingette line? around the edge of the entire sectional?

How do you tell? well according to Mitsipilot, there's a note. I can't find this myself, maybe it's because the only East Coast sectionals I have predate the 1993 Airspace change, or maybe I'm just not looking in the right place. Apart from seeing a notation to this effect, look at the spaces between the airways; you know the Class E airspace starts at 1200 feet at the airway, if there is no blue vingette line indicating the limits of Class E airspace starting at 1200 ft AGL then it's *all* Class E above 1200 feet between the airways.

>>>>it would be class G to 18000.

well no, in the Lower 48 states, the class G will end at 14,500 feet MSL, above that is Class E airspace.

regards

 

[flywithastick]

The entire Houston area is class E floor 700' agl. Note the magenta around the entire area.

 

[A Squared]

>>>>>The entire Houston area is class E floor 700' agl. Note the magenta around the entire area.

Yeah, maybe I should have been clearer, by "Houston" I meant the area on the Houston sectional. No doubt, the entire area around the city of Houston has controlled airspace starting at 700 feet or lower.

regards

 

[huskerfan]

hey guys thanks for your help so far. I made a mistake in my earlier post about G going up to 18000 I did mean 14500. However no one really answered my question so i'll try to restate it. My question is when you look at a sectional why can one assume all airpace from 1200' and up is Class E. The only thing I found was from a publication in the ASA Private Oral Exam Guide. It mentioned that the blue vignette has been removed and refers to AIM 3-2-6. I looked up AIM 3-2-6 and found nothing to that nature. I really would like an official FAA publication stating that. Does anyone know where it may be stated. Thanks
Huskerfan

 

[A Squared]

>>>>> My question is when you look at a sectional why can one assume all airpace from 1200' and up is Class E.

OK, I thought that I answered that. Perhaps I didn't explain myself well. I'll try again.

First, understand that this is not true for all sectionals. there are many areas of the country where the floor of controlled airspace is higher than 1200 agl.

second, this isn't something that needs an "official source", it's more of an exercise in logic and analytical thinking.

Now, think about what the blue vingetting depicts; it depicts the boundary between an area where the floor of the class E airspace is at 1200' AGL and an area where the floor of the class E airspace is higher. to look at it a different way, the blue vingetting depicts the boundary between an area of class G airspace ending at 1200' AGL and an area where class G airspace extends above 1200' agl.

with me so far?

OK, so what does it mean if there is No blue vingetting? If there is no blue vingetting, it must mean either:

a) The class E airspace begins at 1200 feet or lower everywhere.

or

b) There is no class E airspace starting at 1200' AGL.

Now if you know that there *is* class E airspace starting at 1200" AGL, (victor airways) then you know the "b" can't be true, so it must be "a"



see it now?


regards

 

[Mitsipilot]

Again, look on the chart legend of the Houston sectional.

 

[A Squared]

Again, look on the chart legend of the Houston sectional.

Again, where do you see that note? Not questioning it's existence, just haven't been able to find it on my (outdated) charts.


regards

 

[chawbein]

Do you mean this statement on the sectional??

Class E Airspace exists at 1200' AGL unless otherwise designated as shown above

(refering to the magenta and blue lines described above)

My sectional is only a year old...

 

[huskerfan]

Hey guys I finally found the note on the sectional. I never noticed it before or just may not have payed attention to it. Thanks