Small aircraft pilot penetrates floor of class B airspace without clearance.

Attributes
ACN	292590
Time
Date	199501
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : osi
State Reference	CA
Altitude	msl bound lower : 4200 msl bound upper : 4200
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : oak
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi
Experience	flight time last 90 days : 190 flight time total : 560 flight time type : 530
ASRS Report	292590
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on a flight from sql to sns, I was busy on the radio, then I noticed that I was at 4200 ft MSL, and the class B for sfo is at 4000 ft. I quickly descended, but did unfortunately clip the sfo class B momentarily.

Original NASA ASRS Text

Title: SMA PLT PENETRATES FLOOR OF CLASS B AIRSPACE WITHOUT CLRNC.

Narrative: WHILE ON A FLT FROM SQL TO SNS, I WAS BUSY ON THE RADIO, THEN I NOTICED THAT I WAS AT 4200 FT MSL, AND THE CLASS B FOR SFO IS AT 4000 FT. I QUICKLY DSNDED, BUT DID UNFORTUNATELY CLIP THE SFO CLASS B MOMENTARILY.

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.