Unauthorized runway crossing.

Attributes
ACN	143315
Time
Date	199004
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : oak
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	ground : holding ground other : taxi
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach landing : go around landing other
Route In Use	arrival other
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 3100 flight time type : 450
ASRS Report	143315
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : ground critical incursion : runway non adherence : clearance non adherence : far non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 75 vertical : 75
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was told several mins prior to incident to taxi up to 27L and hold short. I taxied across 27L west/O stopping as a single engine small aircraft was about to land. Oak currently having work done on 27R, so it is closed. I misunderstood and thought the instructions were to 'hold short 27R,' implying 27L could be crossed west/O a clearance because of maintenance. After I was across the threshold, I realized my mistake. Oak ground told me to continue my taxi. I recognized my mistake and apologized for my actions.

Original NASA ASRS Text

Title: UNAUTH RWY CROSSING.

Narrative: WAS TOLD SEVERAL MINS PRIOR TO INCIDENT TO TAXI UP TO 27L AND HOLD SHORT. I TAXIED ACROSS 27L W/O STOPPING AS A SINGLE ENG SMA WAS ABOUT TO LAND. OAK CURRENTLY HAVING WORK DONE ON 27R, SO IT IS CLOSED. I MISUNDERSTOOD AND THOUGHT THE INSTRUCTIONS WERE TO 'HOLD SHORT 27R,' IMPLYING 27L COULD BE CROSSED W/O A CLRNC BECAUSE OF MAINT. AFTER I WAS ACROSS THE THRESHOLD, I REALIZED MY MISTAKE. OAK GND TOLD ME TO CONTINUE MY TAXI. I RECOGNIZED MY MISTAKE AND APOLOGIZED FOR MY ACTIONS.

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.