G-iv captain reported an near midair collision on arrival to teb.

Attributes
ACN	1313758
Time
Date	201511
Local Time Of Day	1801-2400
Place
Locale Reference	TEB.Airport
State Reference	NJ
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Gulfstream IV / G350 / G450
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	Climb
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 70 Flight Crew Total 15700 Flight Crew Type 2200
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 300 Vertical 300

Narrative:

We were on a far 91 IFR flight to teb; approx. 30 NM south of teb in night VMC conditions. ATC had cleared us direct vings maintain 3000 intercept the localizer for ILS 6 approach teb. While still south of vings and level at 3000 ATC called VFR traffic approx. 11 o'clock 5 nm 500 ft below. After a short period ATC announced that the traffic appeared to be climbing; we informed him that we did not have the traffic in sight. ATC then issued a clearance to climb to 4000; turn left to 110 degrees; at the same time we received a TCAS RA commanding a descent. We complied with the RA; informed ATC that we were complying with an RA; and continued our turn. Once we had descended to approx. 2500 ft the TCAS announced clear of conflict. We again told ATC that we had to comply with an RA and said that we could now return to a previous clearance. We were recleared direct to vings and continued to teb and landed uneventfully.

Original NASA ASRS Text

Title: G-IV Captain reported an NMAC on arrival to TEB.

Narrative: We were on a FAR 91 IFR flight to TEB; approx. 30 NM south of TEB in night VMC conditions. ATC had cleared us direct VINGS maintain 3000 intercept the localizer for ILS 6 approach TEB. While still south of VINGS and level at 3000 ATC called VFR traffic approx. 11 o'clock 5 nm 500 ft below. After a short period ATC announced that the traffic appeared to be climbing; we informed him that we did not have the traffic in sight. ATC then issued a clearance to climb to 4000; turn left to 110 degrees; at the same time we received a TCAS RA commanding a DESCENT. We complied with the RA; informed ATC that we were complying with an RA; and continued our turn. Once we had descended to approx. 2500 ft the TCAS announced CLEAR OF CONFLICT. We again told ATC that we had to comply with an RA and said that we could now return to a previous clearance. We were recleared direct to VINGS and continued to TEB and landed uneventfully.

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.