Narrative:

Just south of greeley, at 9500 ft, I contacted denver approach and requested permission to transition 'class B' to centennial. Approach assigned a squawk, advised that I 'already was in class B,' directed me to descend to 8000 ft, and vectored me to centennial, where I arrived about 10 mins later. Once on the ramp, ground advised that I had been requested to contact the supervisor of den approach, which I promptly did upon arriving at the hangar. The supervisor advised that I had entered class B on its northern edge without a prior clearance. He also said that there was no traffic conflict or other problem, but simply wanted to advise me of the new limits (now a 30, not 20, mi circle) of class B. Upon looking at the TCA chart, I allowed that I 'guessed' that he was right, although the chart is very confusing with its 2 30-mi non concentric (one a class B, the other a mode C) circles, generally emanating from the den (117.9) and falcon (116.3) vors. It appeared as if I had ventured about 1 or 2 mi into the class B circle on the north end before turning west, while awaiting the squawk assignment. The floor of class B airspace at that point is 8000 ft, I was 9500 ft. Clearly, MEA culpa.

Google
 

Original NASA ASRS Text

Title: THE RPTR FLEW INTO THE CLASS B AIRSPACE WITHOUT A CLRNC. THE RPTR FEELS THE DESIGN OF THE AIRSPACE IS CONFUSING WITH THE 30 NM MODE C ARC LOCATED FARTHER AWAY FROM DENVER THAN THE 30 DME CLASS B ARC. THE 30 DME CLASS B ARC IS SHOWN AS 30 DME ARC AT THE S SIDE OF THE CHART DEPICTION AND NOT ON THE N SIDE.

Narrative: JUST S OF GREELEY, AT 9500 FT, I CONTACTED DENVER APCH AND REQUESTED PERMISSION TO TRANSITION 'CLASS B' TO CENTENNIAL. APCH ASSIGNED A SQUAWK, ADVISED THAT I 'ALREADY WAS IN CLASS B,' DIRECTED ME TO DSND TO 8000 FT, AND VECTORED ME TO CENTENNIAL, WHERE I ARRIVED ABOUT 10 MINS LATER. ONCE ON THE RAMP, GND ADVISED THAT I HAD BEEN REQUESTED TO CONTACT THE SUPVR OF DEN APCH, WHICH I PROMPTLY DID UPON ARRIVING AT THE HANGAR. THE SUPVR ADVISED THAT I HAD ENTERED CLASS B ON ITS NORTHERN EDGE WITHOUT A PRIOR CLRNC. HE ALSO SAID THAT THERE WAS NO TFC CONFLICT OR OTHER PROB, BUT SIMPLY WANTED TO ADVISE ME OF THE NEW LIMITS (NOW A 30, NOT 20, MI CIRCLE) OF CLASS B. UPON LOOKING AT THE TCA CHART, I ALLOWED THAT I 'GUESSED' THAT HE WAS RIGHT, ALTHOUGH THE CHART IS VERY CONFUSING WITH ITS 2 30-MI NON CONCENTRIC (ONE A CLASS B, THE OTHER A MODE C) CIRCLES, GENERALLY EMANATING FROM THE DEN (117.9) AND FALCON (116.3) VORS. IT APPEARED AS IF I HAD VENTURED ABOUT 1 OR 2 MI INTO THE CLASS B CIRCLE ON THE N END BEFORE TURNING W, WHILE AWAITING THE SQUAWK ASSIGNMENT. THE FLOOR OF CLASS B AIRSPACE AT THAT POINT IS 8000 FT, I WAS 9500 FT. CLRLY, MEA CULPA.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.