Taxied onto the overrun area of runway account poor runway marking.

Attributes
ACN	88617
Time
Date	198806
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sbp
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 10 flight time total : 2500 flight time type : 150
ASRS Report	88617
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation
Situations
Airport	other physical facility

Narrative:

I received a taxi clearance to runway 25, which is very unusual at sbp. The normal runway is 11 or 29, and I have never before taxied to runway 25. I had the location of the runup area for 25 incorrectly visualized in my mind and as I taxied toward 25, I taxied past the hold line and the undershoot/overrun area for runway 7-25. The tower called me on this and I immediately cleared the area. As the runway is now marked, it is possible to taxi onto runway 25, on the yellow centerline and not encounter the hold line. The gap is a full taxiway in width and needs to be marked. See attached diagrams for clarification.

Original NASA ASRS Text

Title: TAXIED ONTO THE OVERRUN AREA OF RWY ACCOUNT POOR RWY MARKING.

Narrative: I RECEIVED A TAXI CLRNC TO RWY 25, WHICH IS VERY UNUSUAL AT SBP. THE NORMAL RWY IS 11 OR 29, AND I HAVE NEVER BEFORE TAXIED TO RWY 25. I HAD THE LOCATION OF THE RUNUP AREA FOR 25 INCORRECTLY VISUALIZED IN MY MIND AND AS I TAXIED TOWARD 25, I TAXIED PAST THE HOLD LINE AND THE UNDERSHOOT/OVERRUN AREA FOR RWY 7-25. THE TWR CALLED ME ON THIS AND I IMMEDIATELY CLRED THE AREA. AS THE RWY IS NOW MARKED, IT IS POSSIBLE TO TAXI ONTO RWY 25, ON THE YELLOW CENTERLINE AND NOT ENCOUNTER THE HOLD LINE. THE GAP IS A FULL TXWY IN WIDTH AND NEEDS TO BE MARKED. SEE ATTACHED DIAGRAMS FOR CLARIFICATION.

Data retrieved from NASA's ASRS site as of August 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.