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zippy
02-22-2002, 03:28 AM
Apologies if this is too obvious or has already been Q and A'd. I couldn't find anything doing a search.

Anywho, what does class d airspace mean? And how do you know you're in it?

Can it be determind using the GPS display, ie: the rings surrounding the a/c? Also, is altitude a factor?

Thanks. :)

Silverblade
02-22-2002, 05:17 AM
Airports that are not associated with Class B or C airspace have become class D airspace. These are control zones (CZ) with operating control towers and airport traffic areas (ATA). A segmented blue line depicts class D airspace on sectional and world aeronautical charts. The ceiling of Class D airspace is 2500 AGL (charted in MSL), and the lateral dimensions are dependent upon the instrument approaches at that airport. Two-way radio communication is required. Cloud and visibility clearance is 3 miles, with 500' below, 1000' above, and 2000' horizontal. Pilots must have two-way radio communication to enter class D airspace.

The only way you'll know where they are is to use a Sectional Aeronautical chart.

Silverblade

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flyinggriffin
02-22-2002, 07:50 AM
I believe you also need weather reporting to qualify as class D. Schenectady County has part time tower and the weather reports stop when the tower closes. It reverts to class G.
If you blow through low and close enough to the tower so they catch your registration number, you will know you were in class D when the FAA pays you a visit :)

lnuss
02-22-2002, 09:56 AM
LAST EDITED ON Feb-22-02 AT 09:56AM (EDT)[p]For the definitive word, go to FAR Part 71: http://www.access.gpo.gov/nara/cfr/cfrhtml_00/Title_14/14cfr71_00.html

Larry N.

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Thorvund
02-22-2002, 12:31 PM
The ceiling of class delta airspace is not always 2500 feet. You need to look at your sectional to determine the ceiling for individual airspaces.

Silverblade
02-22-2002, 01:11 PM
Like I said...

According to: http://www.elmendorf.af.mil/Units/90FS/airspace.htm

"The fourth airspace is Class D Airspace which is generally that airspace from the surface to 2,500 feet above the airport elevation"

and...

http://www.faa.gov/ATpubs/AIR/air1702.html

"Class D areas should normally extend upward from the surface up to and including 2,500 feet AGL. The altitude shall be converted to MSL and rounded to the nearest 100 feet. "

Perhaps you should read the book.

Silverblade

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flyinggriffin
02-22-2002, 03:59 PM
I will bet that he was looking at a sectional and saw the MSL altitude rather than the ASL. Schenectady Cty, is 2900msl on the charts. It is still only 2500ft agl, except for a small chunk bit out of it by the Albany Class C.

mdklatt
02-22-2002, 07:13 PM
LAST EDITED ON Feb-22-02 AT 07:14PM (EDT)[p]Perhaps you should look a Dallas-Fort Worth sectional. Thorvund is right--not all Class D airpspace extends to 2500 feet AGL. Notice the qualifiers "generally" and "normally" in the text you quoted. The Class D area for Dallas Redbird only goes to 2300 feet, and when Dallas NAS was open their airspace stopped at 1500.

eagle013
02-22-2002, 07:50 PM
U.S. airspace classifications---

Class A (alfa)
Airspace from 18,000 ft (5,486 m)
above mean sea level (MSL) up to and
including FL600 (Flight Level 600 =
60,000 ft/18,288 m). Unless otherwise
authorized, pilots must operate under
instrument flight rules in Class A airspace.

Class B (bravo)
Controlled airspace from the surface to
10,000 ft (3,048 m) AGL surrounding
the busiest airports. Class B airspace
volumes are individually tailored, but
usually include airspace within 30 miles
of the primary airport. Itís often referred
to as an upside-down wedding cake, and
you can see why looking at the graphic
(although not all Class B volumes are
shaped this way). To operate in Class B
airspace, there are requirements in
terms of pilot certification, weather
conditions, and aircraft equipment in the
real world that you donít need to worry
about in Flight Simulator 2002. Youíre
required to contact and receive a clear-ance
from ATC prior to entering Class B
airspace. In Flight Simulator 2002, ATC
behaves as though Flight Following
service is automatic when departing
airports in Class B or Class C airspace.

Class C (charlie)
Airspace from the surface to 4,000 ft
(1,219 m) AGL above an airport with an
operational control tower and that is
serviced by a TRACON. Class C airspace
is individually tailored for the airport, but
it usually extends for five nautical miles
(9.26 km) from the surface to 4,000 ft,
and then has a shelf area extending to
10 nautical miles (18.52 km) from
1,200 ft (366 m) to 4,000 ft. Youíre
required to establish communication with
ATC prior to entering Class C airspace.

Class D (delta)
Airspace from the surface to 2,500 ft
(762 m) MSL above an airport with an
operational control tower. Class D air-space
is individually tailored for the
airport it surrounds. Youíre required to
establish communication with ATC prior
to entering Class D airspace.

Class E (echo)
All other controlled airspace that is not
Class A, B, C, or D. Youíre not required to
communicate with anyone when flying in
Class E airspace unless the weather is IFR.

Class G (golf)
Uncontrolled airspace with three different
altitude levels: from the surface up to
and including 1,200 ft (365.76 m)
above ground level (AGL), more than
1,200 ft AGL but less than 10,000 ft
(3,048 m) MSL, and at or above 10,000
ft MSL up to but not including 14,500 ft
(4,420 m) MSL. Youíre not required to
communicate with anyone when flying in
Class G airspace.

For more information on airspace classes, see the Air Traffic Control handbook (/fs2002/help/atc.pdf).

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Thorvund
02-23-2002, 02:09 PM
"Perhaps you should read the book."

There is nothing quite as enjoyable as a pilot with a holier than thou attitude. I love being in the air with pilots that always think they know the definitive answer to everything.

You can tell a lot about a person by the way the respond to another person's mistake. My mistake was not incorrect, it would have worked for any Class Delta airspace in the country. No need for condescending attitudes.

wyskass
02-23-2002, 03:57 PM
Just in case you try to use the WAC's, class D airspaces aren't depicted on those charts. They are only drawn on sectionals.
MIKE

mdklatt
02-23-2002, 07:44 PM
Look at the color of the airport. On WAC charts or sectionals, all airports with a control tower are blue. Most of these will have Class D airspace. The ones with Class C or Class B instead should be obvious.