MD80 crew crossed runway 24L in lax at taxiway aa without being certain they had clearance to cross.

Attributes
ACN	454380
Time
Date	199911
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 300 flight time total : 28000 flight time type : 16000
ASRS Report	454380
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	non adherence : company policies non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Landed on runway 24R lax. Told to follow the DC10 in front of us. Controller stated they would try to cross 2 at the same time. While performing the after landing checklist, I asked the copilot if we had received clearance to cross. As the DC10 crossed, we followed on premise that the controller was trying to get both aircraft across. There was no other instruction to hold short. No mention from ground control to the contrary.

Original NASA ASRS Text

Title: MD80 CREW CROSSED RWY 24L IN LAX AT TXWY AA WITHOUT BEING CERTAIN THEY HAD CLRNC TO CROSS.

Narrative: LANDED ON RWY 24R LAX. TOLD TO FOLLOW THE DC10 IN FRONT OF US. CTLR STATED THEY WOULD TRY TO CROSS 2 AT THE SAME TIME. WHILE PERFORMING THE AFTER LNDG CHKLIST, I ASKED THE COPLT IF WE HAD RECEIVED CLRNC TO CROSS. AS THE DC10 CROSSED, WE FOLLOWED ON PREMISE THAT THE CTLR WAS TRYING TO GET BOTH ACFT ACROSS. THERE WAS NO OTHER INSTRUCTION TO HOLD SHORT. NO MENTION FROM GND CTL TO THE CONTRARY.

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.