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#1
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![]() Newps wrote: Mxsmanic wrote: Newps writes: You can only be in one airspace at a time. At TTD notice the class D circle isn't a full cirlce. It gets cut off where the class C goes to the ground. Yeah, but look at the altitudes. The top of the Class D appears to be _above_ the floor of the Class C that it overlaps. The class C does not exist where the class D does. Are you sure about that? Providence Class C protrudes into Quonset Point class D airspace and the Quonset Tower is very adamant that the overlapping area is Class C and requires communication with Providence. |
#2
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Jarod writes:
Newps wrote: Mxsmanic wrote: Newps writes: You can only be in one airspace at a time. At TTD notice the class D circle isn't a full cirlce. It gets cut off where the class C goes to the ground. Yeah, but look at the altitudes. The top of the Class D appears to be _above_ the floor of the Class C that it overlaps. The class C does not exist where the class D does. Are you sure about that? Providence Class C protrudes into Quonset Point class D airspace and the Quonset Tower is very adamant that the overlapping area is Class C and requires communication with Providence. I'm looking at the inset on the Seattle sectional right now. The dotted line of the TTD Class D doesn't extend into the central part of the PDX Class C (where the latter starts at the surface). However, in the two Class C sectors outside that, you see the dotted line of the Class D, and 25 in a box, indicating that the Class D extends up to 2500 feet inclusive. But those two Class C sectors start at 1700 and 2000 feet, both below the ceiling of the Class D. So is 2000 feet Class C, or Class D? -- Transpose mxsmanic and gmail to reach me by e-mail. |
#3
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![]() "Mxsmanic" wrote in message ... Jarod writes: Newps wrote: Mxsmanic wrote: Newps writes: You can only be in one airspace at a time. At TTD notice the class D circle isn't a full cirlce. It gets cut off where the class C goes to the ground. Yeah, but look at the altitudes. The top of the Class D appears to be _above_ the floor of the Class C that it overlaps. The class C does not exist where the class D does. Are you sure about that? Providence Class C protrudes into Quonset Point class D airspace and the Quonset Tower is very adamant that the overlapping area is Class C and requires communication with Providence. I'm looking at the inset on the Seattle sectional right now. The dotted line of the TTD Class D doesn't extend into the central part of the PDX Class C (where the latter starts at the surface). However, in the two Class C sectors outside that, you see the dotted line of the Class D, and 25 in a box, indicating that the Class D extends up to 2500 feet inclusive. But those two Class C sectors start at 1700 and 2000 feet, both below the ceiling of the Class D. So is 2000 feet Class C, or Class D? -- Transpose mxsmanic and gmail to reach me by e-mail. Should be just like a Class B that has shelves over a Class D, i.e. SEA Class B over Boeing Field (BFI), Class D at BFI goes to 2500, but the Class B starts at 1100, 1800, 2000, and 3000 over various parts of BFI's Class D... In your example/situation from 2000', or where ever the Class C shelf starts, should be Class C. Speculating why they don't put the different Class D ceilings for the different "sectors" might be because then the chart would be more cluttered and more difficult to read, especially while flying. Class C is more "restrictive" than Class D, and thus "overrides" the Class D. You will typically find more IFR traffic and larger planes in Class C than you will in Class D, and typically just plain more traffic in Class C. I believe the person that said "Class C does not exist where the class D does" was only refering to the surface airspaces. |
#4
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One thing you can be sure of with ATC. Only one controller owns the
airspace at any given time. Those two facilities have gotten together to iron out the airspace. Jarod wrote: Newps wrote: Mxsmanic wrote: Newps writes: You can only be in one airspace at a time. At TTD notice the class D circle isn't a full cirlce. It gets cut off where the class C goes to the ground. Yeah, but look at the altitudes. The top of the Class D appears to be _above_ the floor of the Class C that it overlaps. The class C does not exist where the class D does. Are you sure about that? Providence Class C protrudes into Quonset Point class D airspace and the Quonset Tower is very adamant that the overlapping area is Class C and requires communication with Providence. |
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