B737 first officer reported a TCAS RA and an near midair collision while on an ATC cleared descent t...

Attributes
ACN	1525807
Time
Date	201803
Place
Locale Reference	MDPP.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Cruise
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Type 5672
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Vertical 500

Narrative:

While on an ATC cleared descent through 18;000 ft to 15;000 ft; with the autopilot on; in VNAV; an aircraft appeared on our TCAS in front of us; approximately 800 ft below us; and approximately 2 miles away. We received a TA; and looked out to acquire the aircraft visually. No sooner did we look up then we got an RA to 'climb; climb'. I disengaged the automation and responded to the RA climb as per the RA red box on the display. The traffic was a multi turboprop; flying east to west; at 17;500 ft presumably VFR. The captain proceeded to tell ATC about our RA as well as the traffic we flew over. Atcs response was merely a 'roger'. ATC never called out the traffic; and seemed un-phased by the near miss. My approximation put the other aircraft less than 500 ft vertically and nearly 0 ft laterally once we flew over him.

Original NASA ASRS Text

Title: B737 First Officer reported a TCAS RA and an NMAC while on an ATC cleared descent to MDPP airport.

Narrative: While on an ATC cleared descent through 18;000 ft to 15;000 ft; with the autopilot on; in VNAV; an aircraft appeared on our TCAS in front of us; approximately 800 ft below us; and approximately 2 miles away. We received a TA; and looked out to acquire the aircraft visually. No sooner did we look up then we got an RA to 'Climb; Climb'. I disengaged the automation and responded to the RA climb as per the RA red box on the display. The traffic was a multi turboprop; flying east to west; at 17;500 ft presumably VFR. The Captain proceeded to tell ATC about our RA as well as the traffic we flew over. ATCs response was merely a 'roger'. ATC never called out the traffic; and seemed un-phased by the near miss. My approximation put the other aircraft less than 500 ft vertically and nearly 0 ft laterally once we flew over him.

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 first officer reported a TCAS RA and an near midair collision while on an ATC cleared descent to mdpp airport.