Large transport crew and an air carrier aircraft were involved in less than legal separation.

Attributes
ACN	418719
Time
Date	199810
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : hnk
State Reference	NY
Altitude	msl bound lower : 27000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 165 flight time total : 6500 flight time type : 2000
ASRS Report	418719
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

While cruising at FL270 en route to ewr, after an en route rerte, ZOB controller switched us from their frequency 127.47 to ZBW frequency of 126.47. Upon dialing in the ZBW frequency, ZBW was calling us to turn immediately for traffic. At the same time, the TCASII alerted to traffic off our right side. We acknowledged ZBW's turn instructions and immediately turned 60 degrees left. ZBW told air carrier XXX to turn right 60 degrees immediately, which they did and acknowledged. Visual contact was made with both planes confirming both were at the same altitude. TCASII showed both aircraft came within 4 NM of each other at the same altitude.

Original NASA ASRS Text

Title: LGT CREW AND AN ACR ACFT WERE INVOLVED IN LESS THAN LEGAL SEPARATION.

Narrative: WHILE CRUISING AT FL270 ENRTE TO EWR, AFTER AN ENRTE RERTE, ZOB CTLR SWITCHED US FROM THEIR FREQ 127.47 TO ZBW FREQ OF 126.47. UPON DIALING IN THE ZBW FREQ, ZBW WAS CALLING US TO TURN IMMEDIATELY FOR TFC. AT THE SAME TIME, THE TCASII ALERTED TO TFC OFF OUR R SIDE. WE ACKNOWLEDGED ZBW'S TURN INSTRUCTIONS AND IMMEDIATELY TURNED 60 DEGS L. ZBW TOLD ACR XXX TO TURN R 60 DEGS IMMEDIATELY, WHICH THEY DID AND ACKNOWLEDGED. VISUAL CONTACT WAS MADE WITH BOTH PLANES CONFIRMING BOTH WERE AT THE SAME ALT. TCASII SHOWED BOTH ACFT CAME WITHIN 4 NM OF EACH OTHER AT THE SAME ALT.

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.