Narrative:

We were being vectored for the ILS to runway 4R in newark. We were southwest of the airport; level at 3000'. ATC gave us a traffic advisory for a VFR aircraft 500' below our altitude. No more than 5 seconds after that advisory; we were given a TA from the TCAS; followed immediately by an RA to 'climb'. I disengaged the autopilot and began to follow the RA guidance while the first officer let ATC know we were in a TCAS climb situation. ATC acknowledged and told us to climb no higher than 3500'; as there was other traffic above us. As we leveled at 3500' we received another RA to 'monitor vertical speed'. This command was for us to just stay level at 3500. I then saw the VFR traffic (appeared to be a cessna model) pass directly below us at what looked to be less than 1000' lower than our current altitude. After clearing the traffic; ATC issued us a clearance back down to 3000 and we continued towards the approach.the main threat in this situation is congested airspace; with the addition of light GA traffic on days where the weather is nice. I am unaware if an error on the part of the VFR pilot contributed to our TCAS to generate an RA.I will continue to maintain a vigilant scan for traffic; especially in good VFR flying days.

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Original NASA ASRS Text

Title: First Officer reported maneuvering for a TCAS RA; while being vectored for an ILS to EWR; that resulted in a second RA with another aircraft.

Narrative: We were being vectored for the ILS to runway 4R in Newark. We were southwest of the airport; level at 3000'. ATC gave us a traffic advisory for a VFR aircraft 500' below our altitude. No more than 5 seconds after that advisory; we were given a TA from the TCAS; followed immediately by an RA to 'Climb'. I disengaged the Autopilot and began to follow the RA guidance while the FO let ATC know we were in a TCAS climb situation. ATC acknowledged and told us to climb no higher than 3500'; as there was other traffic above us. As we leveled at 3500' we received another RA to 'monitor vertical speed'. This command was for us to just stay level at 3500. I then saw the VFR traffic (appeared to be a Cessna model) pass directly below us at what looked to be less than 1000' lower than our current altitude. After clearing the traffic; ATC issued us a clearance back down to 3000 and we continued towards the approach.The main threat in this situation is congested airspace; with the addition of light GA traffic on days where the weather is nice. I am unaware if an error on the part of the VFR pilot contributed to our TCAS to generate an RA.I will continue to maintain a vigilant scan for traffic; especially in good VFR flying days.

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.