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Question about Airspace...

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VW Pilot

MMM...PIGEON CASSEROLE
Joined
Jun 3, 2006
Posts
257
Hi All.

Ok The other day I was reading through my ASA Prvt. Pilot manual
and towards the end of the chapter, there are questions that could possibly
pop up on the written. One of them asks....

Where in the contigeous 48 states and District of Columbia is radar beacon
transponder equipped with mode c required? Well the answer was...In controlled airspace above 10,000FT MSL and in Class B Airspace. But another question refering to this one asks, If you planned to fly above 1200 ft AGL in class G airspace(uncontrolled) would it be any different???? Well the answer turned up being no...BUT WHY??? My instuctor told me that if there is a class G airport withing the boundaries of class B airspace, for certain altitudes like 700ft to 1200 ft they allow that to be controlled.....But I'm still wondering why....Still a bit confused about this. But I'm guessing. Is this so Class B Airports can keep an eye on you so you don't violate their airspace??? That is, if you are getting close, they can say, HEY You need a clearance, GO BACK!!!

I hope I'm on the right track as to finding out why...Thanx ALL.
 
Last edited:
Not sure about it being controlled, but you must have a mode C transponder within 30 nm of most (all?) class B airports up to 10,000 msl (FAR 91.215). So, you may have class G airspace where a mode C transponder is required. This may be what the question is referring to.
 
Class G goes up to 14,500ft msl in some parts of the country so therefore at anytime above 10,000 feet you would require a 4096 mode C transponser, also above 10,000ft weather minimums change to 5 miles vis 1000 feet below, 1000 feet above, and 1 mile horizontally due to less speed restrictions.
 
First of all, you need to leave the words "controlled" or "uncontrolled" completely out of the answer when answering the question "when is a mode "c" transponder required?"

The answer is within:
-Class A, B, and C airspace,
-within the lateral boundaries of Class B airspace,
-Above class C airspace
-within a Mode C veil (within 30 NM of a primary class B airport)
-above 10,000 feet MSL if above 2500 AGL

...just leave "uncontrolled" or "controlled" completely out of it.
 

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