A possible near midair collision was turned into a potential conflict thanks to TCASII RA.

Attributes
ACN	273808
Time
Date	199406
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : yul
State Reference	PQ
Altitude	msl bound lower : 33000 msl bound upper : 33600
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : czul artcc : ztl
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	273808
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

At approximately 35Z on yul 277/48 we got a TCASII TA. Traffic was noted on TCASII display approximately 12 mi at 12 O'clock 300 ft below and climbing head on. I took the autoplt off and turned right to displace the traffic. The copilot called center to advise of the conflict but we got an RA commanding a climb of about 1800 FPM. We followed the RA and topped at 33600 ft before the clear of traffic was announced by TCASII. We tried to inform center but the controller was making frantic calls to the other aircraft and did not hear us. I estimate the aircraft passed approximately 1 1/2 mi to the left and 300 ft below. We returned to 33000 ft and on course.

Original NASA ASRS Text

Title: A POSSIBLE NMAC WAS TURNED INTO A POTENTIAL CONFLICT THANKS TO TCASII RA.

Narrative: AT APPROX 35Z ON YUL 277/48 WE GOT A TCASII TA. TFC WAS NOTED ON TCASII DISPLAY APPROX 12 MI AT 12 O'CLOCK 300 FT BELOW AND CLBING HEAD ON. I TOOK THE AUTOPLT OFF AND TURNED R TO DISPLACE THE TFC. THE COPLT CALLED CTR TO ADVISE OF THE CONFLICT BUT WE GOT AN RA COMMANDING A CLB OF ABOUT 1800 FPM. WE FOLLOWED THE RA AND TOPPED AT 33600 FT BEFORE THE CLR OF TFC WAS ANNOUNCED BY TCASII. WE TRIED TO INFORM CTR BUT THE CTLR WAS MAKING FRANTIC CALLS TO THE OTHER ACFT AND DID NOT HEAR US. I ESTIMATE THE ACFT PASSED APPROX 1 1/2 MI TO THE L AND 300 FT BELOW. WE RETURNED TO 33000 FT AND ON COURSE.

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.