B737 captain reported a near midair collision while on final approach; and going around on the secon...

Attributes
ACN	1488314
Time
Date	201710
Local Time Of Day	0601-1200
Place
Locale Reference	TJSJ.Airport
State Reference	FO
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Twin Otter DHC-6
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 20000
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Procedural Published Material / Policy

Narrative:

We were on approach to runway 08. Around 1;500 ft; tower warned us of traffic at 2. First officer (first officer) was flying and saw traffic and said going around. About that same time; I picked up the traffic too. We started climbing and then the TCAS gave us a TA/RA and we max-power climbed; I saw the twin otter turning and climbing into us. Why he was running around that part of the airspace I am curious about; anyway we out rated him. The alert cleared and we cleaned up and went around.then on the second approach we went around again due to a VFR aircraft that was maneuvered in front of us. Tjsj tower was unsafe!

Original NASA ASRS Text

Title: B737 Captain reported a near midair collision while on final approach; and going around on the second approach; both due to lack of traffic separation from ATC.

Narrative: We were on approach to Runway 08. Around 1;500 ft; Tower warned us of traffic at 2. FO (First Officer) was flying and saw traffic and said going around. About that same time; I picked up the traffic too. We started climbing and then the TCAS gave us a TA/RA and we max-power climbed; I saw the twin otter turning and climbing into us. Why he was running around that part of the airspace I am curious about; anyway we out rated him. The alert cleared and we cleaned up and went around.Then on the second approach we went around again due to a VFR aircraft that was maneuvered in front of us. TJSJ Tower was unsafe!

Data retrieved from NASA's ASRS site 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.

B737 captain reported a near midair collision while on final approach; and going around on the second approach; both due to lack of traffic separation from ATC.