"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.