Narrative:

Takeoff pdk near sunset for VFR to aik. Pdk CTAF (control tower) was controling. Prior to requested left turn to on-course (105 degrees) which pdk had approved, but I had not executed, pdk tower instructed me to change to atl approach. I continued to climb on runway heading (takeoff) of 200 degrees (I was aware that the floor of the class B airspace was 8000 ft at pdk and extended south for, I thought, 6-8 mi and my intention was to take off and immediately turn east (105 degrees) and would not have to worry about where the class B airspace floor dropped to 6000 ft) while attempting to call atl approach. When they finally answered (4TH or 5TH transmission) their only instruction was 'remain VFR' with no altitude restr. I replied that 'will remain VFR. I am in your airspace (meaning below class B, but controled by atl approach), will follow your instructions.' immediately turned left to 105 degrees and continued to climb. At 7500 ft, I received a call asking if I had just departed pdk. I answered 'yes.' controller then asked if I was familiar with atl class B airspace. I replied that I was and believed I was in the 8000 ft floor ring. He then instructed me to initiate immediate descent to 5500 ft, which I did. He gave me a telephone number and instructed me to call the tower when I landed. I called the tower when I landed and discussed situation with supervisor. Better departure planning by me and atl approach answering VFR calls promptly, giving altitude restrs in remain VFR instruction would have helped avoid this situation.

Related reports:

Google
 

Original NASA ASRS Text

Title: PLT OF A C182 CLBED INTO CLASS B AIRSPACE WHEN DEPARTING AN ARPT UNDERLYING CLASS B AIRSPACE.

Narrative: TKOF PDK NEAR SUNSET FOR VFR TO AIK. PDK CTAF (CTL TWR) WAS CTLING. PRIOR TO REQUESTED L TURN TO ON-COURSE (105 DEGS) WHICH PDK HAD APPROVED, BUT I HAD NOT EXECUTED, PDK TWR INSTRUCTED ME TO CHANGE TO ATL APCH. I CONTINUED TO CLB ON RWY HDG (TKOF) OF 200 DEGS (I WAS AWARE THAT THE FLOOR OF THE CLASS B AIRSPACE WAS 8000 FT AT PDK AND EXTENDED S FOR, I THOUGHT, 6-8 MI AND MY INTENTION WAS TO TAKE OFF AND IMMEDIATELY TURN E (105 DEGS) AND WOULD NOT HAVE TO WORRY ABOUT WHERE THE CLASS B AIRSPACE FLOOR DROPPED TO 6000 FT) WHILE ATTEMPTING TO CALL ATL APCH. WHEN THEY FINALLY ANSWERED (4TH OR 5TH XMISSION) THEIR ONLY INSTRUCTION WAS 'REMAIN VFR' WITH NO ALT RESTR. I REPLIED THAT 'WILL REMAIN VFR. I AM IN YOUR AIRSPACE (MEANING BELOW CLASS B, BUT CTLED BY ATL APCH), WILL FOLLOW YOUR INSTRUCTIONS.' IMMEDIATELY TURNED L TO 105 DEGS AND CONTINUED TO CLB. AT 7500 FT, I RECEIVED A CALL ASKING IF I HAD JUST DEPARTED PDK. I ANSWERED 'YES.' CTLR THEN ASKED IF I WAS FAMILIAR WITH ATL CLASS B AIRSPACE. I REPLIED THAT I WAS AND BELIEVED I WAS IN THE 8000 FT FLOOR RING. HE THEN INSTRUCTED ME TO INITIATE IMMEDIATE DSCNT TO 5500 FT, WHICH I DID. HE GAVE ME A TELEPHONE NUMBER AND INSTRUCTED ME TO CALL THE TWR WHEN I LANDED. I CALLED THE TWR WHEN I LANDED AND DISCUSSED SIT WITH SUPVR. BETTER DEP PLANNING BY ME AND ATL APCH ANSWERING VFR CALLS PROMPTLY, GIVING ALT RESTRS IN REMAIN VFR INSTRUCTION WOULD HAVE HELPED AVOID THIS SIT.

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.