C182 pilot attempts takeoff on taxiway vice runway 21L as cleared by tower.

Attributes
ACN	795560
Time
Date	200807
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sff.airport
State Reference	WA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll ground : taxi
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 10 flight time total : 1600 flight time type : 550
ASRS Report	795560
Events
Anomaly	incursion : taxiway non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to original clearance flight crew : rejected takeoff
Supplementary
Problem Areas	Flight Crew Human Performance Airport
Primary Problem	Flight Crew Human Performance

Narrative:

I was going for an early evening flight after work; preflted the C182; started; checked ATIS and taxied out of hangar row. I contacted ground control and was told to taxi to runway 21L. There are 2 areas that are used for run-up for runway 21L. I usually use the area beyond the parallel taxiway; but today I used the one before the taxiway. My preflight inspection complete; I contacted felts tower and was cleared for takeoff on runway 21L. I departed the run-up area; turned left; and started my takeoff roll. Within 100 ft; I recognized something was wrong: the 'runway' was narrow; and there was a solid yellow line rather than a broken white line. I was taking off on the parallel taxiway! I certainly could have taken off on that surface; since it runs the whole length of the runway; and there was no conflicting traffic; but not a good idea! I stopped within another 100 ft; taxied back to runway 21L and departed without incident. The root cause was inadequate attention; but it was a setup because I used the different run-up area.

Original NASA ASRS Text

Title: C182 PLT ATTEMPTS TKOF ON TXWY VICE RWY 21L AS CLRED BY TOWER.

Narrative: I WAS GOING FOR AN EARLY EVENING FLT AFTER WORK; PREFLTED THE C182; STARTED; CHKED ATIS AND TAXIED OUT OF HANGAR ROW. I CONTACTED GND CTL AND WAS TOLD TO TAXI TO RWY 21L. THERE ARE 2 AREAS THAT ARE USED FOR RUN-UP FOR RWY 21L. I USUALLY USE THE AREA BEYOND THE PARALLEL TXWY; BUT TODAY I USED THE ONE BEFORE THE TXWY. MY PREFLT INSPECTION COMPLETE; I CONTACTED FELTS TWR AND WAS CLRED FOR TKOF ON RWY 21L. I DEPARTED THE RUN-UP AREA; TURNED L; AND STARTED MY TKOF ROLL. WITHIN 100 FT; I RECOGNIZED SOMETHING WAS WRONG: THE 'RWY' WAS NARROW; AND THERE WAS A SOLID YELLOW LINE RATHER THAN A BROKEN WHITE LINE. I WAS TAKING OFF ON THE PARALLEL TXWY! I CERTAINLY COULD HAVE TAKEN OFF ON THAT SURFACE; SINCE IT RUNS THE WHOLE LENGTH OF THE RWY; AND THERE WAS NO CONFLICTING TFC; BUT NOT A GOOD IDEA! I STOPPED WITHIN ANOTHER 100 FT; TAXIED BACK TO RWY 21L AND DEPARTED WITHOUT INCIDENT. THE ROOT CAUSE WAS INADEQUATE ATTN; BUT IT WAS A SETUP BECAUSE I USED THE DIFFERENT RUN-UP AREA.

Data retrieved from NASA's ASRS site as of May 2009 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.