BE99 pilot erroneously penetrated class B airspace departing bfi.

Attributes
ACN	424900
Time
Date	199901
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bfi
State Reference	WA
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Airliner 99
Route In Use	enroute : on vectors
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 2300 flight time type : 220
ASRS Report	424900
Person 2
Affiliation	government : faa
Function	controller : departure
Events
Anomaly	non adherence : far other anomaly other other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

On taxi out from boeing field I was looking for a pop up clearance to get through a thin fog layer over the area. I was told to depart straight out VFR and that they did not give pop up clrncs. I was not given a squawk code and told to give departure my request. Climbing out of 1500 ft I was switched to departure. At that time I deviated my course to the east so not to enter class B airspace. When I finally checked on, departure didn't know who I was and told me I had entered class B airspace without a clearance. I had thought my position was further east than what center was showing. I was level at 2500 ft and then was given a pop up clearance and continued to my destination without further incident.

Original NASA ASRS Text

Title: BE99 PLT ERRONEOUSLY PENETRATED CLASS B AIRSPACE DEPARTING BFI.

Narrative: ON TAXI OUT FROM BOEING FIELD I WAS LOOKING FOR A POP UP CLRNC TO GET THROUGH A THIN FOG LAYER OVER THE AREA. I WAS TOLD TO DEPART STRAIGHT OUT VFR AND THAT THEY DID NOT GIVE POP UP CLRNCS. I WAS NOT GIVEN A SQUAWK CODE AND TOLD TO GIVE DEP MY REQUEST. CLBING OUT OF 1500 FT I WAS SWITCHED TO DEP. AT THAT TIME I DEVIATED MY COURSE TO THE E SO NOT TO ENTER CLASS B AIRSPACE. WHEN I FINALLY CHKED ON, DEP DIDN'T KNOW WHO I WAS AND TOLD ME I HAD ENTERED CLASS B AIRSPACE WITHOUT A CLRNC. I HAD THOUGHT MY POS WAS FURTHER E THAN WHAT CTR WAS SHOWING. I WAS LEVEL AT 2500 FT AND THEN WAS GIVEN A POP UP CLRNC AND CONTINUED TO MY DEST WITHOUT FURTHER INCIDENT.

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.