CORP BE40 LNDG SDL RPTED A NMAC WITH A TWIN CESSNA NEAR PHX ARPT.

Narrative

UPON ARR INTO SDL AREA; PHOENIX APCH WAS VECTORING US AT 5000 FT AROUND PHX AIRSPACE. WE WERE ISSUED TFC ADVISORY FOR MULTIPLE TARGETS AT 2 O'CLOCK; HIGHEST ONE WAS 3000 FT. OUR TCAS WAS INDICATING ONE ACFT AT 4200 FT AND CLBING; WE INQUIRED ABOUT THE TFC; ATC FINALLY ACKNOWLEDGED HIM AND RPTED AS VFR. WE WATCHED HIM ON TCAS; CLBING TOWARDS US. OUR TCAS LIT UP RED AND GAVE A CLB COMMAND. WE IMMEDIATELY ADDED FULL POWER AND NOSE UP ATTITUDE; JUST IN TIME TO SEE THE PISTON TWIN ACFT PASSING DIRECTLY UNDER US. HORIZONTAL SEPARATION WOULD HAVE BEEN MEASURED IN INCHES; OVERHEAD SEPARATION EXCEEDED 100 FT BUT ONLY BECAUSE OF THE RAPID PULL-UP. ADVISED ATC OF NEAR-MISS AND REQUESTED THE PHONE NUMBER. WE DISCUSSED THE ISSUE WITH APCH AND BASICALLY GOT THE 'NOT MY AIRSPACE; NOT MY PROBLEM' RESPONSE. OUR PAX ALSO REQUESTED THE NUMBER TO THE ATC FACILITY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR BELIEVES THEY WERE AROUND 5 MILES NW OF CHD NEAR P-19. HE WAS THE FO AND PLT FLYING FROM THE LEFT SEAT AND SAW A BLUE AND WHITE CESSNA 421 OR 414 PASS VERY CLOSE ON THE LEFT SIDE CLIMBING. AFTER LNDG THEY CONTACTED THE SDL TWR AND WERE TOLD PHX AIRSPACE IS BECOMING VERY CONGESTED.