Light transport flight crew misinterprets position and hold clearance for takeoff clearance.

Attributes
ACN	261579
Time
Date	199401
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fat
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ont
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : instrument pilot : atp
Experience	flight time last 90 days : 85 flight time total : 4800 flight time type : 85
ASRS Report	261579
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	incursion : runway non adherence : clearance other anomaly other
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:

Misunderstood a position and hold clearance for a takeoff clearance and took off. I feel fatigue was a contributing factor. It was nearly the end of my fourth consecutive day on duty which was to become a 14 hour 11 min duty day (the 3 previous days were 15 hours 24 mins, 12 hours 45 mins and 13 hours 18 mins on duty). I was also working with a new first officer in an airplane I was fairly new to, and flying in a new area and may have been distracted by cockpit duties as well as pressure to get back on schedule.

Original NASA ASRS Text

Title: LTT FLC MISINTERPRETS POS AND HOLD CLRNC FOR TKOF CLRNC.

Narrative: MISUNDERSTOOD A POS AND HOLD CLRNC FOR A TKOF CLRNC AND TOOK OFF. I FEEL FATIGUE WAS A CONTRIBUTING FACTOR. IT WAS NEARLY THE END OF MY FOURTH CONSECUTIVE DAY ON DUTY WHICH WAS TO BECOME A 14 HR 11 MIN DUTY DAY (THE 3 PREVIOUS DAYS WERE 15 HRS 24 MINS, 12 HRS 45 MINS AND 13 HRS 18 MINS ON DUTY). I WAS ALSO WORKING WITH A NEW FO IN AN AIRPLANE I WAS FAIRLY NEW TO, AND FLYING IN A NEW AREA AND MAY HAVE BEEN DISTRACTED BY COCKPIT DUTIES AS WELL AS PRESSURE TO GET BACK ON SCHEDULE.

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.