A cessna citation III crossed an active runway without clearance at lgb.

Attributes
ACN	434550
Time
Date	199904
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lgb.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 11400
ASRS Report	434550
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After clear to taxi was read back to ground control, I taxied across runway under the assumption that I was to hold at another hold position. I incorrectly failed to ask for clarification from ground and 'assumed' to know where the controller wanted me to cross the active runway. I was taxiing down the wrong taxiway and crossed an inactive runway, even though I had read the taxi clearance back. Poor headwork on my part! Controller was heads up and very alert to situation. No other traffic or aircraft were involved.

Original NASA ASRS Text

Title: A CESSNA CITATION III CROSSED AN ACTIVE RWY WITHOUT CLRNC AT LGB.

Narrative: AFTER CLR TO TAXI WAS READ BACK TO GND CTL, I TAXIED ACROSS RWY UNDER THE ASSUMPTION THAT I WAS TO HOLD AT ANOTHER HOLD POS. I INCORRECTLY FAILED TO ASK FOR CLARIFICATION FROM GND AND 'ASSUMED' TO KNOW WHERE THE CTLR WANTED ME TO CROSS THE ACTIVE RWY. I WAS TAXIING DOWN THE WRONG TXWY AND CROSSED AN INACTIVE RWY, EVEN THOUGH I HAD READ THE TAXI CLRNC BACK. POOR HEADWORK ON MY PART! CTLR WAS HEADS UP AND VERY ALERT TO SIT. NO OTHER TFC OR ACFT WERE INVOLVED.

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.