Flight crew in B757 at lax were cleared for takeoff. Flight crew did not hear the tower cancel takeoff clearance but aborted when they heard a transmission on the radio that indicated they should not be departing.

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Attributes
ACN	413005
Time
Date	199808
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	landing : go around landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	413005
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : rejected takeoff other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Tower cleared us for takeoff. We did checklist final items. As we approached 80 KTS, someone on frequency said 'tower, air carrier X is taking off.' I had heard radio chatter as we were doing final items, including a go around command from tower to an air carrier B747 on runway 25L. I then saw the B747 over runway 25L and then realized that tower must have made radio call that we didn't hear. As we had plenty of runway left, I deselected rejected takeoff so wouldn't have to worry about hot brakes or needlessly upsetting passenger. We rolled about 4000 ft then turned off runway. Tower never said another word. I requested discrete tower frequency to talk to supervisor and explained we never heard the radio call, and in the future it would help if the controller got an acknowledgement or at least repeated the instructions. He understood we were doing checklist items during those critical 5-7 seconds. Supervisor stated he would address this issue with his people. This is too critical an area of flight not to get positive readback from aircraft concerned.

Original NASA ASRS Text

Title: FLC IN B757 AT LAX WERE CLRED FOR TKOF. FLC DID NOT HEAR THE TWR CANCEL TKOF CLRNC BUT ABORTED WHEN THEY HEARD A XMISSION ON THE RADIO THAT INDICATED THEY SHOULD NOT BE DEPARTING.

Narrative: TWR CLRED US FOR TKOF. WE DID CHKLIST FINAL ITEMS. AS WE APCHED 80 KTS, SOMEONE ON FREQ SAID 'TWR, ACR X IS TAKING OFF.' I HAD HEARD RADIO CHATTER AS WE WERE DOING FINAL ITEMS, INCLUDING A GAR COMMAND FROM TWR TO AN ACR B747 ON RWY 25L. I THEN SAW THE B747 OVER RWY 25L AND THEN REALIZED THAT TWR MUST HAVE MADE RADIO CALL THAT WE DIDN'T HEAR. AS WE HAD PLENTY OF RWY LEFT, I DESELECTED RTO SO WOULDN'T HAVE TO WORRY ABOUT HOT BRAKES OR NEEDLESSLY UPSETTING PAX. WE ROLLED ABOUT 4000 FT THEN TURNED OFF RWY. TWR NEVER SAID ANOTHER WORD. I REQUESTED DISCRETE TWR FREQ TO TALK TO SUPVR AND EXPLAINED WE NEVER HEARD THE RADIO CALL, AND IN THE FUTURE IT WOULD HELP IF THE CTLR GOT AN ACKNOWLEDGEMENT OR AT LEAST REPEATED THE INSTRUCTIONS. HE UNDERSTOOD WE WERE DOING CHKLIST ITEMS DURING THOSE CRITICAL 5-7 SECONDS. SUPVR STATED HE WOULD ADDRESS THIS ISSUE WITH HIS PEOPLE. THIS IS TOO CRITICAL AN AREA OF FLT NOT TO GET POSITIVE READBACK FROM ACFT CONCERNED.

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.