Narrative:

Upon arrival into sdl area, phoenix approach was vectoring us at 5000 ft around phx airspace. We were issued traffic advisory for multiple targets at 2 O'clock, highest one was 3000 ft. Our TCAS was indicating one aircraft at 4200 ft and climbing, we inquired about the traffic, ATC finally acknowledged him and reported as VFR. We watched him on TCAS, climbing towards us. Our TCAS lit up red and gave a climb command. We immediately added full power and nose up attitude, just in time to see the piston twin aircraft 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 approach and basically got the 'not my airspace, not my problem' response. Our passenger also requested the number to the ATC facility. Callback conversation with reporter revealed the following information: reporter believes they were around 5 miles northwest of chd near P-19. He was the first officer and pilot flying from the left seat and saw a blue and white cessna 421 or 414 pass very close on the left side climbing. After landing they contacted the sdl tower and were told phx airspace is becoming very congested.

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Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 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.