Talk:Controlled airspace

message: I'm not sure why you added 'in the United States'. Those five classes are the five ICAO classes of controlled airspace and the United States now uses those five classes to conform with the international standard. Are there still countries that have controlled airspace that isn't class A, B, C, D, or E?
The most recent change, saying that radar is not required for class B and C is incorrect. There must be radar coverage or class B/C services will be terminated. See, for example, http://www.faa.gov/atpubs/ATC/Chp7/atc0708.html
However, the change still makes the text clearer, so it should not be reverted.
Rationale for 22 March 2005 edits: 
-Radar coverage is not always available in controlled airspace. The example of Class D areas without radar coverage, cited later, is the most obvious example, but there are others, especially in the western U.S. 
-The statement that most airspace above 1,200 agl is controlled airspace is probably not true outside the U.S. 
-The previous language could have been interpreted as saying that IFR flight is not safe in uncontrolled airspace, which is a matter of opinion and pilot judgement. 
-One could argue that the clearance of IFR aircraft into class B is implicit, not explicit.
-Most readers will not know what "altitude-encoding" means. 
-I believe that the Cessna 172 has been built in greater numbers than any other aircraft, so the statement that most small planes are not capable of flying above 12,500 msl is probably not true. 
-Class C does not require a clearance of any kind, neither explicit nor implicit, only radio communications. 
-The criterion for classes B and C is how busy the airport is, not how big it is. 
-The previous language left open the possibility that class F might be used in the U.S. for purposes other than special use airspace. 
-Neither IFR nor VFR flights are required to be in radio contact with ATC in Class G airspace. (Note that 14 CFR 91.183 only applies to controlled airspace.)
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I reverted the names of the airspace classes to letter form (A, B, C, etc.) because that is the way they are defined in the regulations. See 14CFR Part 71, for example. 
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=9be71c36700767b16411b91386a78d2d&rgn=div5&view=text&node=14:2.0.1.2.6&idno=14
Phonetics are not necessary in print unless you are writing a tutorial on radio usage. Palmpilot900 23:02, 4 October 2005 (UTC)

message: This article is US centric, and also appears to have strayed into describing airspace classification and uncontrolled airspace.
Since there is a seperate article on ICAO Airspace Classification, does anyone have any problems with me re-writing it to be based upon the ICAO definitions of Controlled Airspace?BaseTurnComplete 12:00, 4 April 2006 (UTC)
thread_title:  Re-write 

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