Shaun3000 From United States of America, joined Mar 2002, 445 posts, RR: 0 Posted (11 years 2 months 3 weeks 2 days 7 hours ago) and read 2724 times:
Simple question: is there any class D airspace in the US with a shelf? By shelf I mean a portion of D airspace that starts at some point AGL, like at most C and B airports. I have heard people mention that they thought there are a few examples of D airspace with a shelf. I know D is usually just a single cylinder.
AA_Cam From , joined Dec 1969, posts, RR: Reply 1, posted (11 years 2 months 3 weeks 2 days 7 hours ago) and read 2704 times:
It is common to see abnormally shaped class D which has been designed with the Instrument procedures that go along with an airport in mind. Sometimes you will see a box outside the normal cylinder, extended out from the centerline of a major runway. This is to keep the aircraft in a smooth transition between class E to D, without scraping the top of the G airspace which comes up to 700 ft AGL at those areas... (inside the magenta "fade", outside the blue dotted line).. That way ATC always has "control" over the aircraft.
So no, Class D isn't always a cylinder.. But no, I haven't seen shelves. Sometimes you'll also see those same boxes, except defined in magenta dotted lines... Inside this space. This space is not class D, its class E, but instead of flooring out at 700 AGL, it goes all the away to the ground... The purpose of this, again to assist in the aircraft on approach to transition from class E to D, without wandering into G.
USAFHummer From United States of America, joined May 2000, 10685 posts, RR: 53 Reply 3, posted (11 years 2 months 3 weeks 1 day 16 hours ago) and read 2630 times:
While I personally havent seen tiered Class D airspace on a chart...what some class D airports have is a TRSA...which is two tiered airspace, similar in shape (not necessarily size though) to Class C airspace...airports that have this to my knowledge include ERI (Erie, PA) and AVP (Scranton/Wilkes-Barre, PA)...
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Saxman66 From United States of America, joined Sep 2000, 518 posts, RR: 0 Reply 4, posted (11 years 2 months 3 weeks 12 hours ago) and read 2620 times:
Cameron, what kind of question is this? Class D with a shelf? cmon! jk. I've never seen class D with a shelf. That would probably make it class C. But if you really want why don't you come over to my room a couple doors down, and we'll discuss this question, in which you ponder.
AA_Cam From , joined Dec 1969, posts, RR: Reply 6, posted (11 years 2 months 3 weeks 10 hours ago) and read 2602 times:
Oh cmon TEX... I didnt ask the question... and like I said.. there are no Class D airspace (that I know of) that have shelves!! But there is Class D airspace that has approach departure tears... such as Grand Forks AFB.. check it out on your Twin Cities Sectional.
Now that the Joking has been put aside...
RALGHA.. Yes.. it is more common to see those boxes as Class E, in Magenta Segmented Lines... HOWEVER, it is not at all uncommon to see those boxes to be Blue Segmented Lines, as CLASS D airspace.. it does happen. Grand Forks AFB is a good example. Another good example is Mansfield (KMFD)... KNFW, Clinton-Sherman (KCSM), Sheppard AFB (KSPS), Mc Kinney (KTKI), Chyenne (KCYS) and Ellsworth AFB (KRCA), are all also good examples of this Class D box.