Falcon 2000
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 50; Flight Crew Total 7000; Flight Crew Type 2000
Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Flight Crew Took Evasive Action
Human Factors
On instrument descent to PBI we were direct to ZISUR intersection for the ILS 10R. We saw a TCAS target in front of us that was descending. ATC advised [us] of VFR traffic at our 12 o'clock. At the time; we were in and out of the clouds (broken to scattered at 4000-8000 feet). As non-flying pilot; I saw a small Cessna (C172 type) very close to us. I recommended an immediate turn. The pilot flying saw a second airplane (another C172 type) flying loose formation and descending. Simultaneously he received two RA's to climb. It appeared the TCAS was confused by two targets. We safely climbed and turned away from the traffic. ATC informed us they were not in contact with the traffic. We suspect the two planes were illegally flying in and around clouds while heading to Pahoke (PHK) airport. We reported the RA to Palm Beach Approach. Fortunately; they had their TCAS on so that at least we received a TCAS signal while they were flying through clouds without ATC advisories.
Falcon 2000 Captain reported a NMAC with two light aircraft in the vicinity of PBI airport.