Tower controller amended taxi instructions to reporter in a B737-300 in following a B757 across a parallel runway after landing when the runway was not clear when another air carrier in a DC9 had been cleared for takeoff. Tower subsequently issued abort instructions to the DC9.

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Attributes
ACN	422154
Time
Date	199812
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sju
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
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	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer
Experience	flight time last 90 days : 195 flight time total : 5000 flight time type : 570
ASRS Report	422154
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : ground less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Air Traffic Incident	other

Narrative:

After exiting the high speed from lax runway 25L, the captain brought the plane to a stop behind an air carrier Y B757. Lax tower cleared both of us to cross runway 25R. I acknowledged the clearance 'air carrier XXXX cleared across runway 25R.' the captain and I were not aware that an air carrier Z DC9 had been given takeoff clearance. After we crossed the hold line, lax tower directed us to hold short of runway 25R. Air carrier was still on the runway and we were behind air carrier Y. I acknowledged that we were already on the runway. Lax tower canceled takeoff clearance for the air carrier Z on the takeoff roll. Air carrier Z aborted and exited runway 25R. I believe that lax tower was expecting air carrier Y and us to clear runway 25R quicker than we did. This reduced the spacing between air carrier Z and us, causing the abort.

Original NASA ASRS Text

Title: TWR CTLR AMENDED TAXI INSTRUCTIONS TO RPTR IN A B737-300 IN FOLLOWING A B757 ACROSS A PARALLEL RWY AFTER LNDG WHEN THE RWY WAS NOT CLR WHEN ANOTHER ACR IN A DC9 HAD BEEN CLRED FOR TKOF. TWR SUBSEQUENTLY ISSUED ABORT INSTRUCTIONS TO THE DC9.

Narrative: AFTER EXITING THE HIGH SPD FROM LAX RWY 25L, THE CAPT BROUGHT THE PLANE TO A STOP BEHIND AN ACR Y B757. LAX TWR CLRED BOTH OF US TO CROSS RWY 25R. I ACKNOWLEDGED THE CLRNC 'ACR XXXX CLRED ACROSS RWY 25R.' THE CAPT AND I WERE NOT AWARE THAT AN ACR Z DC9 HAD BEEN GIVEN TKOF CLRNC. AFTER WE CROSSED THE HOLD LINE, LAX TWR DIRECTED US TO HOLD SHORT OF RWY 25R. ACR WAS STILL ON THE RWY AND WE WERE BEHIND ACR Y. I ACKNOWLEDGED THAT WE WERE ALREADY ON THE RWY. LAX TWR CANCELED TKOF CLRNC FOR THE ACR Z ON THE TKOF ROLL. ACR Z ABORTED AND EXITED RWY 25R. I BELIEVE THAT LAX TWR WAS EXPECTING ACR Y AND US TO CLR RWY 25R QUICKER THAN WE DID. THIS REDUCED THE SPACING BTWN ACR Z AND US, CAUSING THE ABORT.

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.