Widebody transport in cruise sights aircraft approach from right rear on collision course. TCASII RA sounds as evasive action climb started.

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Attributes
ACN	197162
Time
Date	199112
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cyqx
State Reference	NF
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : cyqx
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000
ASRS Report	197162
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5000
ASRS Report	197163
Events
Anomaly	conflict : airborne less severe non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At FL310 we observed the other aircraft approaching from our right rear at our assigned altitude on a collision course. Almost at the same time that we start our pull up we got an alert from TCASII to 'pull up.' the other aircraft apparently never saw us. There was another aircraft 2000 ft above and slightly ahead on the same track that we had to turn to avoid during our pull up which we were never alerted to during the pull up. The problem was caused by the controller vectoring the other aircraft behind us without adequate clearance (separation). The TCASII works. However I have some concern over the climb rate or/and duration in reference to the aircraft just above and ahead. Had we not made a slight right turn in the climb I wonder if the TCASII would have resolved our secondary problem and stopped our climb once above the first aircraft. We had to be directly in middle of his left front windshield. I wonder why he apparently never saw us, never mentioned our presence to the controller. The controller admitted it was his (controller) fault.

Original NASA ASRS Text

Title: WDB IN CRUISE SIGHTS ACFT APCH FROM R REAR ON COLLISION COURSE. TCASII RA SOUNDS AS EVASIVE ACTION CLB STARTED.

Narrative: AT FL310 WE OBSERVED THE OTHER ACFT APCHING FROM OUR R REAR AT OUR ASSIGNED ALT ON A COLLISION COURSE. ALMOST AT THE SAME TIME THAT WE START OUR PULL UP WE GOT AN ALERT FROM TCASII TO 'PULL UP.' THE OTHER ACFT APPARENTLY NEVER SAW US. THERE WAS ANOTHER ACFT 2000 FT ABOVE AND SLIGHTLY AHEAD ON THE SAME TRACK THAT WE HAD TO TURN TO AVOID DURING OUR PULL UP WHICH WE WERE NEVER ALERTED TO DURING THE PULL UP. THE PROBLEM WAS CAUSED BY THE CTLR VECTORING THE OTHER ACFT BEHIND US WITHOUT ADEQUATE CLRNC (SEPARATION). THE TCASII WORKS. HOWEVER I HAVE SOME CONCERN OVER THE CLB RATE OR/AND DURATION IN REF TO THE ACFT JUST ABOVE AND AHEAD. HAD WE NOT MADE A SLIGHT R TURN IN THE CLB I WONDER IF THE TCASII WOULD HAVE RESOLVED OUR SECONDARY PROBLEM AND STOPPED OUR CLB ONCE ABOVE THE FIRST ACFT. WE HAD TO BE DIRECTLY IN MIDDLE OF HIS L FRONT WINDSHIELD. I WONDER WHY HE APPARENTLY NEVER SAW US, NEVER MENTIONED OUR PRESENCE TO THE CTLR. THE CTLR ADMITTED IT WAS HIS (CTLR) FAULT.

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.