Narrative:

Inbound to [our destination] at 2000 MSL on a 050 heading and 210 KIAS assigned for radar vectors to the visual approach to runway 11. ATC called; 'traffic 10 o`clock at 1800; 2 to 3 miles' I looked for traffic. No joy. Traffic on TCAS showed as an amber target. ATC called; 'traffic 12 o`clock less than a mile.' I pilot flying (PF); said to first officer; 'I don`t have him.' TCAS issued a descent RA of 1600 FPM; the autopilot was disconnected; and the RA was followed.I looked up in time to see a light brown and white C-172 at 12 o`clock pass approximately 300 feet above our airplane. ATC asked; 'what are you doing?' pilot not flying (PNF) responded; 'complying with TCAS RA.' ATC responded; 'ok; continue.' TCAS issued a reduce descent command. ATC said; 'when able; turn to 060. I turned to 060. TCAS issued; 'clear of conflict.' I leveled off at 1400 MSL.we asked ATC what altitude he wanted us at; and we were told 1800 MSL. I climbed back to 1800 MSL. We were then turned inbound and cleared for a visual approach to runway 11 and completed a normal visual approach to and landing to that runway. CRM and cockpit communication worked very well in a busy cockpit; which contributed to a safe outcome to this event.

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Original NASA ASRS Text

Title: Airbus 320 flight crew reported a NMAC during descent; and descending to comply with an TCAS RA.

Narrative: Inbound to [our destination] at 2000 MSL on a 050 heading and 210 KIAS assigned for radar vectors to the visual approach to runway 11. ATC called; 'Traffic 10 o`clock at 1800; 2 to 3 miles' I looked for traffic. No Joy. Traffic on TCAS showed as an amber target. ATC called; 'Traffic 12 o`clock less than a mile.' I Pilot Flying (PF); said to First Officer; 'I don`t have him.' TCAS issued a Descent RA of 1600 FPM; the autopilot was disconnected; and the RA was followed.I looked up in time to see a light brown and white C-172 at 12 o`clock pass approximately 300 feet above our airplane. ATC asked; 'What are you doing?' Pilot Not Flying (PNF) responded; 'Complying with TCAS RA.' ATC responded; 'Ok; continue.' TCAS issued a reduce descent command. ATC said; 'When able; turn to 060. I turned to 060. TCAS issued; 'Clear of conflict.' I leveled off at 1400 MSL.We asked ATC what altitude he wanted us at; and we were told 1800 MSL. I climbed back to 1800 MSL. We were then turned inbound and cleared for a visual approach to runway 11 and completed a normal visual approach to and landing to that runway. CRM and cockpit communication worked very well in a busy cockpit; which contributed to a safe outcome to this event.

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.