Air carrier widebody transport in foreign airspace had a TCASII command to climb. The air carrier climbed 600 ft to avoid aircraft 1100 ft below. ATC did not announce the other aircraft and apparently did not see it. Assigned altitude was resumed.

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Attributes
ACN	207308
Time
Date	199204
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lecm
State Reference	FO
Altitude	msl bound lower : 29000 msl bound upper : 29600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : lecm
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17000
ASRS Report	207308
Person 2
Function	flight crew : single pilot
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

TCASII gave a TA by a RA to climb; we climbed 600 ft to 29600 ft. Aircraft went under us. He was at 28500 ft. Spanish ATC notified.

Original NASA ASRS Text

Title: ACR WDB IN FOREIGN AIRSPACE HAD A TCASII COMMAND TO CLB. THE ACR CLBED 600 FT TO AVOID ACFT 1100 FT BELOW. ATC DID NOT ANNOUNCE THE OTHER ACFT AND APPARENTLY DID NOT SEE IT. ASSIGNED ALT WAS RESUMED.

Narrative: TCASII GAVE A TA BY A RA TO CLB; WE CLBED 600 FT TO 29600 FT. ACFT WENT UNDER US. HE WAS AT 28500 FT. SPANISH ATC NOTIFIED.

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.