A319 landing lax on runway 25L; heard ATC clear aircraft to cross runway; assumed clearance was for their aircraft; but then ATC issued immediate hold clearance.

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Attributes
ACN	685945
Time
Date	200602
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : lax.tower
Operator	common carrier : charter
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 210 flight time total : 7000 flight time type : 1500
ASRS Report	685945
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : ground less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

Holding short of runway 25R at taxiway M; after landing runway 25L; ATC issued a clearance of 'air carrier X continue.' we assumed the clearance was for us to cross runway 25R at taxiway M; and crossed the hold short line by a few ft. ATC issued another clearance of 'air carrier X stop.' we stopped the aircraft; while a turboprop commuter began his takeoff roll. The nose of our aircraft was a few ft beyond the hold short line when the turboprop was airborne off runway 25R.

Original NASA ASRS Text

Title: A319 LNDG LAX ON RWY 25L; HEARD ATC CLR ACFT TO CROSS RWY; ASSUMED CLRNC WAS FOR THEIR ACFT; BUT THEN ATC ISSUED IMMEDIATE HOLD CLRNC.

Narrative: HOLDING SHORT OF RWY 25R AT TXWY M; AFTER LNDG RWY 25L; ATC ISSUED A CLRNC OF 'ACR X CONTINUE.' WE ASSUMED THE CLRNC WAS FOR US TO CROSS RWY 25R AT TXWY M; AND CROSSED THE HOLD SHORT LINE BY A FEW FT. ATC ISSUED ANOTHER CLRNC OF 'ACR X STOP.' WE STOPPED THE ACFT; WHILE A TURBOPROP COMMUTER BEGAN HIS TKOF ROLL. THE NOSE OF OUR ACFT WAS A FEW FT BEYOND THE HOLD SHORT LINE WHEN THE TURBOPROP WAS AIRBORNE OFF RWY 25R.

Data retrieved from NASA's ASRS site as of January 2009 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.