A300 crew had a TCASII RA and near midair collision on departure at mroc.

Attributes
ACN	454910
Time
Date	199911
Day	Sun
Local Time Of Day	0601 To 1200
Place
State Reference	FO
Altitude	agl bound lower : 500 agl bound upper : 2500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
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 : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
ASRS Report	454910
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : multi engine pilot : commercial pilot : atp
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Near midair collision. Cleared for takeoff by sjo tower runway 25. They advised of traffic in a left pattern for airport. We had a TCASII target at 2500 ft AGL on a downwind for runway 25. WX was marginal, 800-1000 ft, ceiling ragged. Took off and at approximately 500 ft, received a TCASII advisory 'monitor vertical speed,' still configured at flaps 15 degrees, V2 +10 KTS, approximately 4000 FPM climb rate. Almost immediate after initial advisory, it changed to a climb RA. Vsi green band was at 6000 FPM and TCASII indicated target was in front of us and 500 ft below. We increased our rate of climb and passed over target by 300 ft. Informed tower of situation and they repeated same traffic information. The traffic we passed over apparently was crossing the VOR sbound as we took off.

Original NASA ASRS Text

Title: A300 CREW HAD A TCASII RA AND NMAC ON DEP AT MROC.

Narrative: NMAC. CLRED FOR TKOF BY SJO TWR RWY 25. THEY ADVISED OF TFC IN A L PATTERN FOR ARPT. WE HAD A TCASII TARGET AT 2500 FT AGL ON A DOWNWIND FOR RWY 25. WX WAS MARGINAL, 800-1000 FT, CEILING RAGGED. TOOK OFF AND AT APPROX 500 FT, RECEIVED A TCASII ADVISORY 'MONITOR VERT SPD,' STILL CONFIGURED AT FLAPS 15 DEGS, V2 +10 KTS, APPROX 4000 FPM CLB RATE. ALMOST IMMEDIATE AFTER INITIAL ADVISORY, IT CHANGED TO A CLB RA. VSI GREEN BAND WAS AT 6000 FPM AND TCASII INDICATED TARGET WAS IN FRONT OF US AND 500 FT BELOW. WE INCREASED OUR RATE OF CLB AND PASSED OVER TARGET BY 300 FT. INFORMED TWR OF SIT AND THEY REPEATED SAME TFC INFO. THE TFC WE PASSED OVER APPARENTLY WAS XING THE VOR SBOUND AS WE TOOK OFF.

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.