B757 captain complains that IFR separation lost after departure controller provides TA of an ATR72 and cleared reporter to climb and maintain visual separation with the other aircraft who had reporter in sight.

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Attributes
ACN	528792
Time
Date	200110
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : pvd.vortac
State Reference	RI
Altitude	msl bound lower : 8000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pvd.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Flight Phase	climbout : vacating altitude
Aircraft 2
Controlling Facilities	tracon : pvd.tracon
Operator	common carrier : air carrier
Make Model Name	ATR 72
Flight Phase	climbout : vacating altitude
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 : 18000 flight time type : 500
ASRS Report	528792
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

In VMC. Departure controller provides TA of an aircraft at our 10 O'clock position. Asked if we had aircraft in sight. We responded that we did. Departure controller cleared us with 'maintain visual separation on that aircraft, climb to 10000 ft. Traffic has you in sight.' we were at 8000 ft MSL. I estimated that traffic was initially about 5 NM. I mistakenly thought we were about parallel. I began a climb at about 1000 FPM, on autoplt. I then saw that I was on intercept course with traffic. In order to obtain greater vertical separation, I increased climb rate to 2500 FPM. Almost immediately I felt that we were not going to have adequate vertical and horizontal separation. I disconnected autoplt and began steep climb to get vertical separation. We got RA on TCASII about this time telling us to descend. We were about 8600 MSL and traffic was at 9000 ft MSL. I continued to climb since I was already in a steep climb and I could obtain vertical separation faster in a climb than if I pushed the aircraft over to descend. I estimate that the air carrier passed below us just as we were leveling at 10000 ft. The other aircraft was behind us at this point.

Original NASA ASRS Text

Title: B757 CAPT COMPLAINS THAT IFR SEPARATION LOST AFTER DEP CTLR PROVIDES TA OF AN ATR72 AND CLRED RPTR TO CLB AND MAINTAIN VISUAL SEPARATION WITH THE OTHER ACFT WHO HAD RPTR IN SIGHT.

Narrative: IN VMC. DEP CTLR PROVIDES TA OF AN ACFT AT OUR 10 O'CLOCK POS. ASKED IF WE HAD ACFT IN SIGHT. WE RESPONDED THAT WE DID. DEP CTLR CLRED US WITH 'MAINTAIN VISUAL SEPARATION ON THAT ACFT, CLB TO 10000 FT. TFC HAS YOU IN SIGHT.' WE WERE AT 8000 FT MSL. I ESTIMATED THAT TFC WAS INITIALLY ABOUT 5 NM. I MISTAKENLY THOUGHT WE WERE ABOUT PARALLEL. I BEGAN A CLB AT ABOUT 1000 FPM, ON AUTOPLT. I THEN SAW THAT I WAS ON INTERCEPT COURSE WITH TFC. IN ORDER TO OBTAIN GREATER VERT SEPARATION, I INCREASED CLB RATE TO 2500 FPM. ALMOST IMMEDIATELY I FELT THAT WE WERE NOT GOING TO HAVE ADEQUATE VERT AND HORIZ SEPARATION. I DISCONNECTED AUTOPLT AND BEGAN STEEP CLB TO GET VERT SEPARATION. WE GOT RA ON TCASII ABOUT THIS TIME TELLING US TO DSND. WE WERE ABOUT 8600 MSL AND TFC WAS AT 9000 FT MSL. I CONTINUED TO CLB SINCE I WAS ALREADY IN A STEEP CLB AND I COULD OBTAIN VERT SEPARATION FASTER IN A CLB THAN IF I PUSHED THE ACFT OVER TO DSND. I ESTIMATE THAT THE ACR PASSED BELOW US JUST AS WE WERE LEVELING AT 10000 FT. THE OTHER ACFT WAS BEHIND US AT THIS POINT.

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.