Light transport begins takeoff without clearance and is told to abort by the tower.

Attributes
ACN	268758
Time
Date	199404
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	climbout : takeoff other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	landing other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 2000 flight time type : 350
ASRS Report	268758
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 5500 flight time type : 350
ASRS Report	269010
Events
Anomaly	conflict : ground less severe non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared for position and hold on runway 1L. I read back the hold instructions. The before takeoff checklist was then completed while in 'position and hold.' I notified the captain that all checklists were completed. The captain stated, he had the radios I had the brakes. (Per crew briefing since it was my leg). Tower controller stated fly runway heading, expect radar vectors to concord. Captain read back these instructions. I set takeoff power, called 70 KTS, captain gave steering (ie. Aircraft control) to me. Before V, tower told us to abort takeoff. Tower asked if we could hold short of 28L. Another voice on the radio said it was ok to cross 28L (this voice was from the landing traffic on runway 28L). Captain took controls to abort takeoff and stopped the aircraft before 28L. Afterthought: when an aircraft is in 'position and hold,' the only instructions given by tower should be 'cleared for takeoff' and nothing else. If departure clearance changes, the tower can deliver this clearance after aircraft is airborne.

Original NASA ASRS Text

Title: LTT BEGINS TKOF WITHOUT CLRNC AND IS TOLD TO ABORT BY THE TWR.

Narrative: WE WERE CLRED FOR POS AND HOLD ON RWY 1L. I READ BACK THE HOLD INSTRUCTIONS. THE BEFORE TKOF CHKLIST WAS THEN COMPLETED WHILE IN 'POS AND HOLD.' I NOTIFIED THE CAPT THAT ALL CHKLISTS WERE COMPLETED. THE CAPT STATED, HE HAD THE RADIOS I HAD THE BRAKES. (PER CREW BRIEFING SINCE IT WAS MY LEG). TWR CTLR STATED FLY RWY HDG, EXPECT RADAR VECTORS TO CONCORD. CAPT READ BACK THESE INSTRUCTIONS. I SET TKOF PWR, CALLED 70 KTS, CAPT GAVE STEERING (IE. ACFT CTL) TO ME. BEFORE V, TWR TOLD US TO ABORT TKOF. TWR ASKED IF WE COULD HOLD SHORT OF 28L. ANOTHER VOICE ON THE RADIO SAID IT WAS OK TO CROSS 28L (THIS VOICE WAS FROM THE LNDG TFC ON RWY 28L). CAPT TOOK CTLS TO ABORT TKOF AND STOPPED THE ACFT BEFORE 28L. AFTERTHOUGHT: WHEN AN ACFT IS IN 'POS AND HOLD,' THE ONLY INSTRUCTIONS GIVEN BY TWR SHOULD BE 'CLRED FOR TKOF' AND NOTHING ELSE. IF DEP CLRNC CHANGES, THE TWR CAN DELIVER THIS CLRNC AFTER ACFT IS AIRBORNE.

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.