B757 departing sju experienced near midair collision, no traffic issued by ATC.

Attributes
ACN	577169
Time
Date	200303
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sju.airport
State Reference	PR
Altitude	agl single value : 900
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sju.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sju.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude climbout : initial
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	577169
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical conflict : nmac non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 400
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

Following an ATR that took a 2 min wake delay, we were cleared to taxi in position and hold. After ATR was cleared, we were given clearance. ATR was straight out, we were on jetss 1 with 060 degree heading. No traffic information was given. At rotation, I heard ATC exchange with another aircraft in which tower said 'all I have is an ATR straight out.' approaching 800 ft AGL, a TA appeared showing a target directly ahead and -900 ft. First officer and I tried to get visual but were not able. I reduced power and leveled off. We were still unable to see intruder. I made a left clearing turn while first officer called ATC and asked for traffic information. Tower replied that the aircraft was in the VFR corridor and was not a factor. TCASII had us as close as 400 ft. I believe this would have been an RA, but for the altitude provision on TCASII. We never had a visual on the aircraft. Tower quickly changed our frequency. I informed the departure controller that we had responded to a TA and he said he would inform his supervisor. There was no traffic given to us or the previous departure. I believe there was an near midair collision.

Original NASA ASRS Text

Title: B757 DEPARTING SJU EXPERIENCED NMAC, NO TFC ISSUED BY ATC.

Narrative: FOLLOWING AN ATR THAT TOOK A 2 MIN WAKE DELAY, WE WERE CLRED TO TAXI IN POS AND HOLD. AFTER ATR WAS CLRED, WE WERE GIVEN CLRNC. ATR WAS STRAIGHT OUT, WE WERE ON JETSS 1 WITH 060 DEG HDG. NO TFC INFO WAS GIVEN. AT ROTATION, I HEARD ATC EXCHANGE WITH ANOTHER ACFT IN WHICH TWR SAID 'ALL I HAVE IS AN ATR STRAIGHT OUT.' APCHING 800 FT AGL, A TA APPEARED SHOWING A TARGET DIRECTLY AHEAD AND -900 FT. FO AND I TRIED TO GET VISUAL BUT WERE NOT ABLE. I REDUCED PWR AND LEVELED OFF. WE WERE STILL UNABLE TO SEE INTRUDER. I MADE A L CLRING TURN WHILE FO CALLED ATC AND ASKED FOR TFC INFO. TWR REPLIED THAT THE ACFT WAS IN THE VFR CORRIDOR AND WAS NOT A FACTOR. TCASII HAD US AS CLOSE AS 400 FT. I BELIEVE THIS WOULD HAVE BEEN AN RA, BUT FOR THE ALT PROVISION ON TCASII. WE NEVER HAD A VISUAL ON THE ACFT. TWR QUICKLY CHANGED OUR FREQ. I INFORMED THE DEP CTLR THAT WE HAD RESPONDED TO A TA AND HE SAID HE WOULD INFORM HIS SUPVR. THERE WAS NO TFC GIVEN TO US OR THE PREVIOUS DEP. I BELIEVE THERE WAS AN NMAC.

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.