An large transport air carrier crew had a near midair collision in the traffic pattern after a missed approach with an aircraft that had just taken off from a parallel runway.

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Attributes
ACN	209891
Time
Date	199205
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 600 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : stl tower : phl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach landing : missed approach landing : go around
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	climbout : takeoff
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 13000 flight time type : 2000
ASRS Report	209891
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 200 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

During a missed approach for 12R at stl (because another aircraft was still on takeoff roll). Tower instructed us to 'climb to 2500 ft, traffic at 12 O'clock, and left turn to 100 degree.' as we turned to 100 degree I saw a light twin at our altitude coming off 12L. Tower said this aircraft was turning to 70 degree. I made a hard left turn to north and continued climb. I feel had I stayed on 100 degree with our closure rate I might have hit the light twin.

Original NASA ASRS Text

Title: AN LGT ACR CREW HAD A NMAC IN THE TFC PATTERN AFTER A MISSED APCH WITH AN ACFT THAT HAD JUST TAKEN OFF FROM A PARALLEL RWY.

Narrative: DURING A MISSED APCH FOR 12R AT STL (BECAUSE ANOTHER ACFT WAS STILL ON TKOF ROLL). TWR INSTRUCTED US TO 'CLB TO 2500 FT, TFC AT 12 O'CLOCK, AND L TURN TO 100 DEG.' AS WE TURNED TO 100 DEG I SAW A LIGHT TWIN AT OUR ALT COMING OFF 12L. TWR SAID THIS ACFT WAS TURNING TO 70 DEG. I MADE A HARD L TURN TO N AND CONTINUED CLB. I FEEL HAD I STAYED ON 100 DEG WITH OUR CLOSURE RATE I MIGHT HAVE HIT THE LIGHT TWIN.

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.