An air carrier MD11 had to take evasive action climb and turn in response to a TCASII command in foreign airspace. Altitude deviation and track heading deviation, but only for a short time.

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Attributes
ACN	346483
Time
Date	199609
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : psp
State Reference	FO
Altitude	msl bound lower : 37000 msl bound upper : 37500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : sllp
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	346483
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Location: 60 NM north of egaso on UA315. At FL370, air carrier Y crossed from west to east in front of us at FL370. TCASII enabled us to have visual contact at 10 NM. A turn was initiated to pass behind traffic. TCASII commanded climb, climb was initiated and TCASII declared clear of conflict. La paz center notified. Confirmed that they had visual contact with us.

Original NASA ASRS Text

Title: AN ACR MD11 HAD TO TAKE EVASIVE ACTION CLB AND TURN IN RESPONSE TO A TCASII COMMAND IN FOREIGN AIRSPACE. ALTDEV AND TRACK HDG DEV, BUT ONLY FOR A SHORT TIME.

Narrative: LOCATION: 60 NM N OF EGASO ON UA315. AT FL370, ACR Y CROSSED FROM W TO E IN FRONT OF US AT FL370. TCASII ENABLED US TO HAVE VISUAL CONTACT AT 10 NM. A TURN WAS INITIATED TO PASS BEHIND TFC. TCASII COMMANDED CLB, CLB WAS INITIATED AND TCASII DECLARED CLR OF CONFLICT. LA PAZ CTR NOTIFIED. CONFIRMED THAT THEY HAD VISUAL CONTACT WITH US.

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.