An air carrier B757 captain reports that he had an near midair collision departing sjo.

Attributes
ACN	351582
Time
Date	199610
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tio airport : sjo
State Reference	FO
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sjo
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Aircraft 2
Make Model Name	Piper Twin Piston Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	351582
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Departing sjo, ramon departure, runway 07, at 3 DME in moderate rain. Received TCASII TA (yellow DOT) with no altitude. Target was directly in our flight path at less than 1 mi. We were climbing at maximum power. Light load. Visibility restr due to rain. First officer found traffic as we were about to climb into him. Appeared to be a twin piper less than 500 ft vertical separation. Captain was PF. I leveled aircraft and increased angle of bank to 45 degrees in order to clear target and avoid thunderstorm. Sjo departure at first said they had no traffic there, then a moment later told us there was a piper in our path. Airport had recently opened after being closed for thunderstorm for about 20 mins. TCASII and first officer's quick sighting definitely saved us. From left seat, target was out of sight above the view of the windscreen.

Original NASA ASRS Text

Title: AN ACR B757 CAPT RPTS THAT HE HAD AN NMAC DEPARTING SJO.

Narrative: DEPARTING SJO, RAMON DEP, RWY 07, AT 3 DME IN MODERATE RAIN. RECEIVED TCASII TA (YELLOW DOT) WITH NO ALT. TARGET WAS DIRECTLY IN OUR FLT PATH AT LESS THAN 1 MI. WE WERE CLBING AT MAX PWR. LIGHT LOAD. VISIBILITY RESTR DUE TO RAIN. FO FOUND TFC AS WE WERE ABOUT TO CLB INTO HIM. APPEARED TO BE A TWIN PIPER LESS THAN 500 FT VERT SEPARATION. CAPT WAS PF. I LEVELED ACFT AND INCREASED ANGLE OF BANK TO 45 DEGS IN ORDER TO CLR TARGET AND AVOID TSTM. SJO DEP AT FIRST SAID THEY HAD NO TFC THERE, THEN A MOMENT LATER TOLD US THERE WAS A PIPER IN OUR PATH. ARPT HAD RECENTLY OPENED AFTER BEING CLOSED FOR TSTM FOR ABOUT 20 MINS. TCASII AND FO'S QUICK SIGHTING DEFINITELY SAVED US. FROM L SEAT, TARGET WAS OUT OF SIGHT ABOVE THE VIEW OF THE WINDSCREEN.

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.