Air carrier crosses runway at lax after misunderstanding clearance.

Attributes
ACN	456445
Time
Date	199912
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	Marginal
Weather Elements	Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax.tower tower : slc.tower
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
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	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 8300 flight time type : 50
ASRS Report	456445
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On landing at lax runway 25L, we were given instructions to turn left off of runway, taxi down parallel and hold short of runway 25L on taxiway F. When we arrived at taxiway F, we were told to cross runway 25L and that the controller would call us back, and that traffic was on a 1 1/2 mi final. The first officer read the clearance back and nothing further was said. Upon reaching runway 25R we were told to cross runway 25R and join taxiway B. When I arrived at the hotel, I had a message to call the control tower. The supervisor informed me that we did not have clearance to cross runway 25L and that a report would be filed. The supervisor said the tape of the controller stated 'expect to cross runway 25L await further instructions.' the traffic was very busy that day and there were a lot of radio xmissions being blocked by other traffic. I believe that the 'expect to' part of the transmission was blocked and we did not hear it. I also believe the proper terminology for this clearance should have been 'hold short of runway 25L await further instructions, traffic on 1 1/2 mi final.

Original NASA ASRS Text

Title: ACR CROSSES RWY AT LAX AFTER MISUNDERSTANDING CLRNC.

Narrative: ON LNDG AT LAX RWY 25L, WE WERE GIVEN INSTRUCTIONS TO TURN L OFF OF RWY, TAXI DOWN PARALLEL AND HOLD SHORT OF RWY 25L ON TXWY F. WHEN WE ARRIVED AT TXWY F, WE WERE TOLD TO CROSS RWY 25L AND THAT THE CTLR WOULD CALL US BACK, AND THAT TFC WAS ON A 1 1/2 MI FINAL. THE FO READ THE CLRNC BACK AND NOTHING FURTHER WAS SAID. UPON REACHING RWY 25R WE WERE TOLD TO CROSS RWY 25R AND JOIN TXWY B. WHEN I ARRIVED AT THE HOTEL, I HAD A MESSAGE TO CALL THE CTL TWR. THE SUPVR INFORMED ME THAT WE DID NOT HAVE CLRNC TO CROSS RWY 25L AND THAT A RPT WOULD BE FILED. THE SUPVR SAID THE TAPE OF THE CTLR STATED 'EXPECT TO CROSS RWY 25L AWAIT FURTHER INSTRUCTIONS.' THE TFC WAS VERY BUSY THAT DAY AND THERE WERE A LOT OF RADIO XMISSIONS BEING BLOCKED BY OTHER TFC. I BELIEVE THAT THE 'EXPECT TO' PART OF THE XMISSION WAS BLOCKED AND WE DID NOT HEAR IT. I ALSO BELIEVE THE PROPER TERMINOLOGY FOR THIS CLRNC SHOULD HAVE BEEN 'HOLD SHORT OF RWY 25L AWAIT FURTHER INSTRUCTIONS, TFC ON 1 1/2 MI FINAL.

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.