A carj crew departing lax took off without a clearance.

Attributes
ACN	532958
Time
Date	200112
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : takeoff roll ground : position and hold ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5400 flight time type : 1500
ASRS Report	532958
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	incursion : runway non adherence : published procedure non adherence : far non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Taxi to runway 25R at lax. Upon switching to tower, we received a call 'in the blind' to take off on runway 25R from taxiway F. I read back 'aircraft X, cleared to go runway 25 from taxiway F.' we taxied onto runway 25R and departed. We received no communication from tower that we were in error. We received a call en route to call lax tower. The person there informed us of what happened. He said that he listened to tape and heard me read back position and hold. I wonder if perhaps use of nonstandard 'cleared to go' instead of 'cleared for takeoff' or 'hold' and 'go' could sound similar. I can think of no other factors contributing. Use of standard terminology is important to prevent occurrences such as this.

Original NASA ASRS Text

Title: A CARJ CREW DEPARTING LAX TOOK OFF WITHOUT A CLRNC.

Narrative: TAXI TO RWY 25R AT LAX. UPON SWITCHING TO TWR, WE RECEIVED A CALL 'IN THE BLIND' TO TAKE OFF ON RWY 25R FROM TXWY F. I READ BACK 'ACFT X, CLRED TO GO RWY 25 FROM TXWY F.' WE TAXIED ONTO RWY 25R AND DEPARTED. WE RECEIVED NO COM FROM TWR THAT WE WERE IN ERROR. WE RECEIVED A CALL ENRTE TO CALL LAX TWR. THE PERSON THERE INFORMED US OF WHAT HAPPENED. HE SAID THAT HE LISTENED TO TAPE AND HEARD ME READ BACK POS AND HOLD. I WONDER IF PERHAPS USE OF NONSTANDARD 'CLRED TO GO' INSTEAD OF 'CLRED FOR TKOF' OR 'HOLD' AND 'GO' COULD SOUND SIMILAR. I CAN THINK OF NO OTHER FACTORS CONTRIBUTING. USE OF STANDARD TERMINOLOGY IS IMPORTANT TO PREVENT OCCURRENCES SUCH AS THIS.

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.