Air taxi aircraft confused due to ramp construction, taxis onto active runway.

Attributes
ACN	156841
Time
Date	199009
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sna
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 8000 flight time type : 5000
ASRS Report	156841
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing orange county airport, I was cleared to taxi to runway 19R at kilo intersection via alpha, to hold short of runway 19L. About 2 hours previous, I taxied out with an IFR instructor for a training flight, and was advised to 'jog' over 'here' to get to kilo, (as air carrier traffic blocks taxiway lima and kilo). Having been in and out of orange county numerous times, I thought I was familiar enough to taxi west/O ground control assistance. (Frequency is very busy). However, with the new ramp and terminal construction changing the taxiway confign and perspectives, familiarity was destroyed. On top of the above, he latest available airport charts show the txwys like they used to be so that was no help. Also, identify of taxiway alpha is difficult to verify when you are on the taxiway and I didn't see any identify of the jog in the taxiway, but I'm sure it has a yellow line. Maybe the diagram will be worth many words. I could see anywhere ahead a place to jog over so concluded I had reached the last place to jog over. I am not sure what the taxiway confign is, but suspect they should identify taxiway 'a' as outer, and 'aa' as inner.

Original NASA ASRS Text

Title: AIR TAXI ACFT CONFUSED DUE TO RAMP CONSTRUCTION, TAXIS ONTO ACTIVE RWY.

Narrative: DEPARTING ORANGE COUNTY ARPT, I WAS CLRED TO TAXI TO RWY 19R AT KILO INTXN VIA ALPHA, TO HOLD SHORT OF RWY 19L. ABOUT 2 HRS PREVIOUS, I TAXIED OUT WITH AN IFR INSTRUCTOR FOR A TRNING FLT, AND WAS ADVISED TO 'JOG' OVER 'HERE' TO GET TO KILO, (AS AIR CARRIER TFC BLOCKS TXWY LIMA AND KILO). HAVING BEEN IN AND OUT OF ORANGE COUNTY NUMEROUS TIMES, I THOUGHT I WAS FAMILIAR ENOUGH TO TAXI W/O GND CTL ASSISTANCE. (FREQ IS VERY BUSY). HOWEVER, WITH THE NEW RAMP AND TERMINAL CONSTRUCTION CHANGING THE TXWY CONFIGN AND PERSPECTIVES, FAMILIARITY WAS DESTROYED. ON TOP OF THE ABOVE, HE LATEST AVAILABLE ARPT CHARTS SHOW THE TXWYS LIKE THEY USED TO BE SO THAT WAS NO HELP. ALSO, IDENT OF TXWY ALPHA IS DIFFICULT TO VERIFY WHEN YOU ARE ON THE TXWY AND I DIDN'T SEE ANY IDENT OF THE JOG IN THE TXWY, BUT I'M SURE IT HAS A YELLOW LINE. MAYBE THE DIAGRAM WILL BE WORTH MANY WORDS. I COULD SEE ANYWHERE AHEAD A PLACE TO JOG OVER SO CONCLUDED I HAD REACHED THE LAST PLACE TO JOG OVER. I AM NOT SURE WHAT THE TXWY CONFIGN IS, BUT SUSPECT THEY SHOULD IDENT TXWY 'A' AS OUTER, AND 'AA' AS INNER.

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.