Narrative:

Several mi from runway 9R, given clearance to land and to hold short of runway 12. Following a dash 7. Our relative distance between each aircraft was decreasing, between 100-200 ft AGL. Advised the first officer to plan for a go around since the dash 7 was still on the runway. A few seconds later, I told the first officer to commence the go around. As the PNF began the process of 'cleaning up' the aircraft and advised the tower we were 'going around,' tower replied with a right turn when speed and altitude permitted. Climbing through 400 ft, my attention was drawn to an object on the left. Sighted a B737 climbing off runway 12. It was slightly below our altitude and converging. There was no relative movement between our 2 aircraft. I took control of the aircraft and began a high angle bank to the right. Glancing back out the side windshield, I noted the B737 starting to turn to the left. The tower issued a turn to the southwest. Advised the first officer I had the aircraft and finished the balked landing procedure and climb checks. Returned to land runway 9R uneventfully. Other than the initial land and hold short clearance indicating operations in progress on runway 12 we did not receive advisories regarding traffic. Do not recall hearing the takeoff clearance for the B737. TCASII did not provide guidance.

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Original NASA ASRS Text

Title: SF340 CREW ENCOUNTERS NMAC DURING GAR IN MIA AIRSPACE.

Narrative: SEVERAL MI FROM RWY 9R, GIVEN CLRNC TO LAND AND TO HOLD SHORT OF RWY 12. FOLLOWING A DASH 7. OUR RELATIVE DISTANCE BTWN EACH ACFT WAS DECREASING, BTWN 100-200 FT AGL. ADVISED THE FO TO PLAN FOR A GAR SINCE THE DASH 7 WAS STILL ON THE RWY. A FEW SECONDS LATER, I TOLD THE FO TO COMMENCE THE GAR. AS THE PNF BEGAN THE PROCESS OF 'CLEANING UP' THE ACFT AND ADVISED THE TWR WE WERE 'GOING AROUND,' TWR REPLIED WITH A R TURN WHEN SPD AND ALT PERMITTED. CLBING THROUGH 400 FT, MY ATTN WAS DRAWN TO AN OBJECT ON THE L. SIGHTED A B737 CLBING OFF RWY 12. IT WAS SLIGHTLY BELOW OUR ALT AND CONVERGING. THERE WAS NO RELATIVE MOVEMENT BTWN OUR 2 ACFT. I TOOK CTL OF THE ACFT AND BEGAN A HIGH ANGLE BANK TO THE R. GLANCING BACK OUT THE SIDE WINDSHIELD, I NOTED THE B737 STARTING TO TURN TO THE L. THE TWR ISSUED A TURN TO THE SW. ADVISED THE FO I HAD THE ACFT AND FINISHED THE BALKED LNDG PROC AND CLB CHKS. RETURNED TO LAND RWY 9R UNEVENTFULLY. OTHER THAN THE INITIAL LAND AND HOLD SHORT CLRNC INDICATING OPS IN PROGRESS ON RWY 12 WE DID NOT RECEIVE ADVISORIES REGARDING TFC. DO NOT RECALL HEARING THE TKOF CLRNC FOR THE B737. TCASII DID NOT PROVIDE GUIDANCE.

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.