A light twin pilot took evasive action from another aircraft while on approach to sql and; after stopping his descent; entered sfo class B at 1;500 ft.

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Attributes
ACN	1068049
Time
Date	201302
Local Time Of Day	0601-1200
Place
Locale Reference	SQL.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Transport Low Wing 2 Turboprop Eng
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 125 Flight Crew Total 13000 Flight Crew Type 4000
Events
Anomaly	Airspace Violation All Types Conflict NMAC
Miss Distance	Horizontal 0 Vertical 300

Narrative:

When about to initiate descent to at sql (1;200 ft); a TCAS target appeared directly below and just in front of my nose at 300 ft below. I stopped my descent until I could see the other aircraft; but while doing so might have slipped the 1;500 ft shelf of the sfo class B that overlies sql at 1;500 ft.

Original NASA ASRS Text

Title: A light twin pilot took evasive action from another aircraft while on approach to SQL and; after stopping his descent; entered SFO Class B at 1;500 FT.

Narrative: When about to initiate descent to at SQL (1;200 FT); a TCAS target appeared directly below and just in front of my nose at 300 FT below. I stopped my descent until I could see the other aircraft; but while doing so might have slipped the 1;500 FT shelf of the SFO Class B that overlies SQL at 1;500 FT.

Data retrieved from NASA's ASRS site as of July 2013 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.