Airspace Abuts other Airspace?
Posted by AmIaPilotYet@reddit | flying | View on Reddit | 11 comments
Posted by AmIaPilotYet@reddit | flying | View on Reddit | 11 comments
EliteEthos@reddit
Blue indicates Class G up to but not including 14,500ft. That is on the solid side of the shading. It’s 1200ft outside of it. It’s hard to find in the lower 48 but it’s prevalent in Alaska.
AmIaPilotYet@reddit (OP)
Thanks. Looks like thats it. I am sure I learned this years ago when I did my private man, I was like what the heck is this :)
Logical-Vacation@reddit
In the old days (like >10 years ago), this was all over the mountain west CONUS.
EliteEthos@reddit
Yup. It seems to have been getting phased out over the last 5 years or so
flyingron@reddit
The cyan vignette used to also appear on the opposite side of most places the magenta vignette was shown to show the 700-to-1200 transition. They decided that was cartographically redundant because there were darned few places where it went from 700 to 14,500 without stepping up to 1200 first. It was removed to avoid clutter.
AmIaPilotYet@reddit (OP)
A student of mine asked me what this means. I ll be honest I do not remember seeing this airspace marking anywhere. I am trying to understand what this means but I don't get it. This weird marking is east of 1E2 airport. The way I read it, it says, airspace beginning at 1200 AGL, which would be class E, touching class G airspace. Well, that is what it is everywhere else...why do they need to call that out here? What am i missing?
nkempt@reddit
You’re living in a time when we have almost completely covered the lower 48 with radar and other controller services. The default for class G is surface to 14,500, unless it’s inside the blue fade at which point it’s G from surface to 1200, then E above. Then inside the magenta fade is G from 0 to 700, etc.
Well almost EVERYTHING now is inside the cyan/blue fade, other than like half of Alaska and this little random area in South Texas.
randombrain@reddit
On the 1E2 side of the line, the airspace is Class G up to 1199' AGL. From 1200' AGL up, it's Class E.
On the (Pvt) Pitcock Rosillos Mountain Ranch side of the line, the airspace is Class G up to 14,499' MSL. From 14,500' MSL up, it's Class E.
cazzipropri@reddit
abuts = lean onto
Logical-Vacation@reddit
"Abuts" here means having a mutual border, or to be adjacent to something laterally (like butting up against something). There's no implication of anything being on top of anything else.
cazzipropri@reddit
I agree that "abut" in general means "touch", not necessarily along the vertical axis.
In OP's specific case, though, the cyan vignette-style boundary always denotes class E that is on top of G, and in that sentence from the legend, the word "abuts" can be replaced with "sits on top of" (if it helps the student) without loss of generality or accuracy.