ATCT local controller at MMMX tower spoke spanish to a mexican air carrier and english to a united states air carrier, both preparing to depart, causing some confusion.

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Attributes
ACN	495160
Time
Date	200012
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmmx.airport
State Reference	FO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : holding ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : mmmx.tower
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 1500
ASRS Report	495160
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 240 flight time total : 13000 flight time type : 1000
ASRS Report	495034
Events
Anomaly	excursion : runway non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Tower cleared us (air carrier X) to cross runway 5L and hold short of runway 5R. First officer of air carrier Y (a B727) was communicating with the tower in spanish and was taxiing into position on runway 5L. We crossed runway 5L in front of the first officer air carrier Y B727 well before it was lined up in position. Tower then informed us that they expected us to cross behind the first officer air carrier Y. If all communications were in english, the situation would have been clear.

Original NASA ASRS Text

Title: ATCT LCL CTLR AT MMMX TWR SPOKE SPANISH TO A MEXICAN ACR AND ENGLISH TO A UNITED STATES ACR, BOTH PREPARING TO DEPART, CAUSING SOME CONFUSION.

Narrative: TWR CLRED US (ACR X) TO CROSS RWY 5L AND HOLD SHORT OF RWY 5R. FO OF ACR Y (A B727) WAS COMMUNICATING WITH THE TWR IN SPANISH AND WAS TAXIING INTO POS ON RWY 5L. WE CROSSED RWY 5L IN FRONT OF THE FO ACR Y B727 WELL BEFORE IT WAS LINED UP IN POS. TWR THEN INFORMED US THAT THEY EXPECTED US TO CROSS BEHIND THE FO ACR Y. IF ALL COMS WERE IN ENGLISH, THE SIT WOULD HAVE BEEN CLR.

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.