<< >> NASA ASRS Report 532862, December 2001

B757 flight crew reject takeoff roll when lax local controller issues takeoff clearance for a second time.

Attributes
ACN	532862
Time
Date	200112
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	532862
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : published procedure
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew faa : investigated other
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Tower cleared us to position and hold approaching intersection F for runway 25R. As we turned into position, we were cleared for takeoff and first officer acknowledged takeoff clearance. After standard power was set at approximately 70 KTS tower said aircraft X position and hold, so I elected to abort. Tower said we were not cleared for takeoff. We said we were. But takeoff was aborted and we turned off the runway to ensure safe operations. We were again cleared into position and hold approaching taxiway F and again cleared to position and hold as we turned on the runway and then shortly thereafter cleared for takeoff. Asked them to check the tapes and called back when we were above 18000 ft. Tower said we were correct, we did have takeoff clearance the first time, but I would rather have him call abort any day than have confusion on the takeoff roll.

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Original NASA ASRS Text

Title: B757 FLC REJECT TKOF ROLL WHEN LAX LCL CTLR ISSUES TKOF CLRNC FOR A SECOND TIME.

Narrative: TWR CLRED US TO POS AND HOLD APCHING INTXN F FOR RWY 25R. AS WE TURNED INTO POS, WE WERE CLRED FOR TKOF AND FO ACKNOWLEDGED TKOF CLRNC. AFTER STANDARD PWR WAS SET AT APPROX 70 KTS TWR SAID ACFT X POS AND HOLD, SO I ELECTED TO ABORT. TWR SAID WE WERE NOT CLRED FOR TKOF. WE SAID WE WERE. BUT TKOF WAS ABORTED AND WE TURNED OFF THE RWY TO ENSURE SAFE OPS. WE WERE AGAIN CLRED INTO POS AND HOLD APCHING TXWY F AND AGAIN CLRED TO POS AND HOLD AS WE TURNED ON THE RWY AND THEN SHORTLY THEREAFTER CLRED FOR TKOF. ASKED THEM TO CHK THE TAPES AND CALLED BACK WHEN WE WERE ABOVE 18000 FT. TWR SAID WE WERE CORRECT, WE DID HAVE TKOF CLRNC THE FIRST TIME, BUT I WOULD RATHER HAVE HIM CALL ABORT ANY DAY THAN HAVE CONFUSION ON THE TKOF ROLL.

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.