Loss of separation between air carrier MD11 and an air carrier B757 deviating around WX at FL290.

Attributes
ACN	398634
Time
Date	199804
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ecg
State Reference	NC
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
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
Route In Use	enroute : atlantic enroute : other oceanic
Flight Plan	IFR
Aircraft 2
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 : other oceanic enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	398634
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	398634
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

65 mi southwest of odeal on A699. We were assigned FL290 mach .80 by ZMA. Our position was about 65 mi southwest odeal on A699 N3248.0/W072.04. TCASII picked up an aircraft at our 1 O'clock position 18 mi same altitude traveling southwest. Tried calling on 130.55 without luck. Our flight paths were converging so we turned south to avoid any threat. The other aircraft passed off our left wing about 3 mi. By turning early we did not get a TCASII RA. Report was made to ny commercial radio on XXXX. Supplemental information from acn 398639: 70N bacus assigned FL290 at bacus. Large WX cell between bacus and burtt. Strong winds from south. Granted 35 mi east deviation. Descent to FL290. At FL290 35 mi not enough, requested 45 mi avoiding WX and turning back to course, received TCASII TA. Continuous turn toward on course and cleared direct nance. New york slow to respond.

Original NASA ASRS Text

Title: LOSS OF SEPARATION BTWN ACR MD11 AND AN ACR B757 DEVIATING AROUND WX AT FL290.

Narrative: 65 MI SW OF ODEAL ON A699. WE WERE ASSIGNED FL290 MACH .80 BY ZMA. OUR POS WAS ABOUT 65 MI SW ODEAL ON A699 N3248.0/W072.04. TCASII PICKED UP AN ACFT AT OUR 1 O'CLOCK POS 18 MI SAME ALT TRAVELING SW. TRIED CALLING ON 130.55 WITHOUT LUCK. OUR FLT PATHS WERE CONVERGING SO WE TURNED S TO AVOID ANY THREAT. THE OTHER ACFT PASSED OFF OUR L WING ABOUT 3 MI. BY TURNING EARLY WE DID NOT GET A TCASII RA. RPT WAS MADE TO NY COMMERCIAL RADIO ON XXXX. SUPPLEMENTAL INFO FROM ACN 398639: 70N BACUS ASSIGNED FL290 AT BACUS. LARGE WX CELL BTWN BACUS AND BURTT. STRONG WINDS FROM S. GRANTED 35 MI E DEV. DSCNT TO FL290. AT FL290 35 MI NOT ENOUGH, REQUESTED 45 MI AVOIDING WX AND TURNING BACK TO COURSE, RECEIVED TCASII TA. CONTINUOUS TURN TOWARD ON COURSE AND CLRED DIRECT NANCE. NEW YORK SLOW TO RESPOND.

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.