Overlapping class C & D

"EDR" wrote in message
...
In article . net,
Steven P. McNicoll wrote:

"EDR" wrote in message
...

OOPS!!!
That should have been MSL in posting.


Ehh? With field elevations ranging from 744' to 906',
substituting MSL for AGL doesn't make a better fit.


Most certainly does!
CCAS floor is 2500 MSL and the ceiling is 4800 MSL.
CCAS tops out 4000 AGL/4800 MSL referenced KCMH.


You wrote:

"The Columbus OH airspace has three CDAS beneath the KCMH CCAS. There is a
LOA between Columbus and each of the three satellites that reduces the CDAS
from 4000 AGL to 2500 AGL, giving the CCAS Approach control the airspace
2500 and above.
(Note that 2500 AGL is the floor of the CCAS surrounding Columbus.)"

Substituting MSL for AGL it would be:

"The Columbus OH airspace has three CDAS beneath the KCMH CCAS. There is a
LOA between Columbus and each of the three satellites that reduces the CDAS
from 4000 MSL to 2500 MSL, giving the CCAS Approach control the airspace
2500 and above.
(Note that 2500 MSL is the floor of the CCAS surrounding Columbus.)"

But none of the Class D airspace is reduced from 4000 MSL to 2500 MSL. The
standard for Class D airspace is 2500' AGL. OSU has a field elevation of
905 MSL and Class D airspace there tops out at 3400 MSL, at the standard
2500 AGL. TZR also has a field elevation of 905 feet and Class D airspace
there also tops out at 3400 MSL, again at the standard 2500 AGL. LCK has a
field elevation of 744 feet and Class D airspace there tops out at 3000 MSL,
a nonstandard 2300 AGL. AGL or MSL, what you wrote is incorrect.



One of the unforeseen concequences of my petition to raise the floor on
the west side of the CCAS was to allow the ILS 10L G/S to descend
through the 5/10 mile floor and reenter the the 5 mile cylinder.
This came to light during an OSU home football game.
An America West pilot filed a near miss report with a banner tow
aircraft. It wasn't all that close.
After granting the petition and raising the floor on the west side 300
feet, the FSDO gave the banner tow waivers the addition airspace.
They changed the waivers and reduced the ceiling for the banner tow
aircraft after the near miss report.


What was the purpose of raising the Class C floor on the west side? Just to
give aircraft there more room to operate without contacting approach?