B737 departure from ont begins takeoff without ATC clearance.

Attributes
ACN	584867
Time
Date	200306
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ont.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	ground : position and hold ground : takeoff roll
Route In Use	departure sid : pom
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	584867
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
ASRS Report	584866
Events
Anomaly	conflict : ground less severe incursion : runway other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : took evasive action flight crew : rejected takeoff
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Holding short at runway 26R ont, had been there 15 mins, watched 6-7 aircraft land. Tower gave several 2-3 min calls to us to extend wait. Very suddenly, in a hurried voice, tower called, company flight number, fly heading 280 degrees, climb to 14000 ft, need your best rate through 6000 ft, cleared with departure instructions at the hold short line. I assumed, with an urgency in the voice, cleared for takeoff. The call actually was cleared into position and hold. I have never received departure instructions, then a position and hold. You always receive, taxi into position and hold, then receive departure instructions with a takeoff clearance. The instructions were different. I was expecting the pomona departure as always -- with a vector and a higher than normal altitude. In a hurried voice it came across as an expedited clearance. Watching planes land in a hazy sky, I didn't know if there was traffic on approach. The whole sequence was not normal. The abort was uneventful, minimum braking. Taxied back and departed with a normal clearance. I feel that I was set up and I took the bait. Supplemental information from acn 584866: as we started our takeoff, tower said to hold our position. Airspeed was minimal. Aircraft was braked and we exited the runway.

Original NASA ASRS Text

Title: B737 DEP FROM ONT BEGINS TKOF WITHOUT ATC CLRNC.

Narrative: HOLDING SHORT AT RWY 26R ONT, HAD BEEN THERE 15 MINS, WATCHED 6-7 ACFT LAND. TWR GAVE SEVERAL 2-3 MIN CALLS TO US TO EXTEND WAIT. VERY SUDDENLY, IN A HURRIED VOICE, TWR CALLED, COMPANY FLT NUMBER, FLY HEADING 280 DEGS, CLB TO 14000 FT, NEED YOUR BEST RATE THROUGH 6000 FT, CLRED WITH DEP INSTRUCTIONS AT THE HOLD SHORT LINE. I ASSUMED, WITH AN URGENCY IN THE VOICE, CLRED FOR TKOF. THE CALL ACTUALLY WAS CLRED INTO POS AND HOLD. I HAVE NEVER RECEIVED DEP INSTRUCTIONS, THEN A POS AND HOLD. YOU ALWAYS RECEIVE, TAXI INTO POS AND HOLD, THEN RECEIVE DEP INSTRUCTIONS WITH A TKOF CLRNC. THE INSTRUCTIONS WERE DIFFERENT. I WAS EXPECTING THE POMONA DEP AS ALWAYS -- WITH A VECTOR AND A HIGHER THAN NORMAL ALT. IN A HURRIED VOICE IT CAME ACROSS AS AN EXPEDITED CLRNC. WATCHING PLANES LAND IN A HAZY SKY, I DIDN'T KNOW IF THERE WAS TFC ON APCH. THE WHOLE SEQUENCE WAS NOT NORMAL. THE ABORT WAS UNEVENTFUL, MINIMUM BRAKING. TAXIED BACK AND DEPARTED WITH A NORMAL CLRNC. I FEEL THAT I WAS SET UP AND I TOOK THE BAIT. SUPPLEMENTAL INFO FROM ACN 584866: AS WE STARTED OUR TKOF, TWR SAID TO HOLD OUR POS. AIRSPD WAS MINIMAL. ACFT WAS BRAKED AND WE EXITED THE RWY.

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.