B737-400 crew had runway incursion at mmsd.

Attributes
ACN	507856
Time
Date	200104
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmsd.airport
State Reference	FO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : i90.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 22000 flight time type : 6000
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 4000 flight time type : 1500
ASRS Report	507856
Events
Anomaly	incursion : runway non adherence : company policies non adherence : far non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued alert none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Ambiguous clearance and language barrier contributed to captain misunderstanding taxi clearance. We were cleared to taxi and hold short of runway 34. First officer understood and read back taxi clearance but was heads down running checklists while captain taxied out on runway (which he thought we were cleared to do). Before first officer could catch error, tower/ground controller called and informed us of error. No conflict occurred on runway.

Original NASA ASRS Text

Title: B737-400 CREW HAD RWY INCURSION AT MMSD.

Narrative: AMBIGUOUS CLRNC AND LANGUAGE BARRIER CONTRIBUTED TO CAPT MISUNDERSTANDING TAXI CLRNC. WE WERE CLRED TO TAXI AND HOLD SHORT OF RWY 34. FO UNDERSTOOD AND READ BACK TAXI CLRNC BUT WAS HEADS DOWN RUNNING CHKLISTS WHILE CAPT TAXIED OUT ON RWY (WHICH HE THOUGHT WE WERE CLRED TO DO). BEFORE FO COULD CATCH ERROR, TWR/GND CTLR CALLED AND INFORMED US OF ERROR. NO CONFLICT OCCURRED ON RWY.

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.