Single pilot aircraft enters class B airspace.

Attributes
ACN	701700
Time
Date	200606
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 3650
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	general aviation : personal
Make Model Name	Small Transport Low Wing 2 Recip Eng
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 22 flight time total : 14600 flight time type : 580
ASRS Report	701700
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	airspace violation : entry non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited penetrated airspace
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

A short VFR flight from xbp to ads (routing under the north side of dfw class B airspace). After takeoff; proceeded eastbound; got the ATIS then contacted approach on the ATIS indicated frequency. Stated position; altitude; code (1200) destination and request for class B clearance. Controller; in 1 transmission; placed me in radar contact; gave me a new squawk; routing to fly; and a frequency change. No mention was made of class B airspace. I expected a clearance into the class B airspace. That expectation; coupled with the nature of the exchange with the controller; caused me to believe (assumed) that I was cleared into class B airspace. Called the new controller and verified altitude and routing. He reconfirmed radar contact. At this point I was under the class B airspace where the ceiling was 5000 ft. My course would take me under a short section where the ceiling was 4000 ft followed by a 3000 ft ceiling. About the midpoint of the 4000 ft section (about 4 NM overall on my track) it suddenly dawned on me that I had not heard 'cleared into bravo!' autoplt off and a hard descending to rn to the left kept me from penetrating the class B airspace. The cpa was 3/4 - 1 mi -- way too close for an unplanned track.

Original NASA ASRS Text

Title: SINGLE PLT ACFT ENTERS CLASS B AIRSPACE.

Narrative: A SHORT VFR FLT FROM XBP TO ADS (ROUTING UNDER THE N SIDE OF DFW CLASS B AIRSPACE). AFTER TKOF; PROCEEDED EBOUND; GOT THE ATIS THEN CONTACTED APCH ON THE ATIS INDICATED FREQ. STATED POS; ALT; CODE (1200) DEST AND REQUEST FOR CLASS B CLRNC. CTLR; IN 1 XMISSION; PLACED ME IN RADAR CONTACT; GAVE ME A NEW SQUAWK; ROUTING TO FLY; AND A FREQ CHANGE. NO MENTION WAS MADE OF CLASS B AIRSPACE. I EXPECTED A CLRNC INTO THE CLASS B AIRSPACE. THAT EXPECTATION; COUPLED WITH THE NATURE OF THE EXCHANGE WITH THE CTLR; CAUSED ME TO BELIEVE (ASSUMED) THAT I WAS CLRED INTO CLASS B AIRSPACE. CALLED THE NEW CTLR AND VERIFIED ALT AND ROUTING. HE RECONFIRMED RADAR CONTACT. AT THIS POINT I WAS UNDER THE CLASS B AIRSPACE WHERE THE CEILING WAS 5000 FT. MY COURSE WOULD TAKE ME UNDER A SHORT SECTION WHERE THE CEILING WAS 4000 FT FOLLOWED BY A 3000 FT CEILING. ABOUT THE MIDPOINT OF THE 4000 FT SECTION (ABOUT 4 NM OVERALL ON MY TRACK) IT SUDDENLY DAWNED ON ME THAT I HAD NOT HEARD 'CLRED INTO BRAVO!' AUTOPLT OFF AND A HARD DSNDING TO RN TO THE L KEPT ME FROM PENETRATING THE CLASS B AIRSPACE. THE CPA WAS 3/4 - 1 MI -- WAY TOO CLOSE FOR AN UNPLANNED TRACK.

Data retrieved from NASA's ASRS site as of January 2009 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.