An air carrier B757 overwater flight at FL350 observed another aircraft at the same altitude cross right to left on TCASII approximately 5-10 mi away. An RA was received and a climb to FL355 was accomplished. No traffic was issued.

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Attributes
ACN	413882
Time
Date	199809
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sju
State Reference	PR
Altitude	msl bound lower : 35000 msl bound upper : 35500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : tjzs
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : atlantic
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	413882
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	413880
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 45000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At approximately XA56Z at FL350 100 mi south of grann intersection, received a TA followed by an RA 'climb.' responded to RA, visually acquired other aircraft at same altitude, moving right to left. After 'clear of conflict' returned to FL350. Maximum deviation 500 ft. Distance between aircraft 5-10 mi. Course was proceeding direct to grann intersection as instructed by ATC. This event happened in uncontrolled airspace over the atlantic.

Original NASA ASRS Text

Title: AN ACR B757 OVERWATER FLT AT FL350 OBSERVED ANOTHER ACFT AT THE SAME ALT CROSS R TO L ON TCASII APPROX 5-10 MI AWAY. AN RA WAS RECEIVED AND A CLB TO FL355 WAS ACCOMPLISHED. NO TFC WAS ISSUED.

Narrative: AT APPROX XA56Z AT FL350 100 MI S OF GRANN INTXN, RECEIVED A TA FOLLOWED BY AN RA 'CLB.' RESPONDED TO RA, VISUALLY ACQUIRED OTHER ACFT AT SAME ALT, MOVING R TO L. AFTER 'CLR OF CONFLICT' RETURNED TO FL350. MAX DEV 500 FT. DISTANCE BTWN ACFT 5-10 MI. COURSE WAS PROCEEDING DIRECT TO GRANN INTXN AS INSTRUCTED BY ATC. THIS EVENT HAPPENED IN UNCTLED AIRSPACE OVER THE ATLANTIC.

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.