Flight crew of large transport on approach to phx at 12000' MSL observed an small aircraft pass directly beneath with approximately 500' clearance from opposite direction.

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Attributes
ACN	108889
Time
Date	198904
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : srp
State Reference	AZ
Altitude	msl bound lower : 11500 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phx
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 185 flight time total : 16000 flight time type : 11000
ASRS Report	108889
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 600
ASRS Report	109265
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at 12,000' MSL, 210 KTS inbound to srp on the srp 010/14 when I saw a white blur at approximately my 11 O'clock. I looked at it and saw a white, light twin diving under the nose of my aircraft. We had zero horizontal clearance and less than 500' vertical. As he passed under our nose, approach control called us to warn of an aircraft at our 11 O'clock, no altitude but squawking VFR. We reported the near miss immediately.

Original NASA ASRS Text

Title: FLT CREW OF LGT ON APCH TO PHX AT 12000' MSL OBSERVED AN SMA PASS DIRECTLY BENEATH WITH APPROXIMATELY 500' CLRNC FROM OPPOSITE DIRECTION.

Narrative: WE WERE LEVEL AT 12,000' MSL, 210 KTS INBND TO SRP ON THE SRP 010/14 WHEN I SAW A WHITE BLUR AT APPROX MY 11 O'CLOCK. I LOOKED AT IT AND SAW A WHITE, LIGHT TWIN DIVING UNDER THE NOSE OF MY ACFT. WE HAD ZERO HORIZONTAL CLRNC AND LESS THAN 500' VERTICAL. AS HE PASSED UNDER OUR NOSE, APCH CTL CALLED US TO WARN OF AN ACFT AT OUR 11 O'CLOCK, NO ALT BUT SQUAWKING VFR. WE REPORTED THE NEAR MISS IMMEDIATELY.

Data retrieved from NASA's ASRS site as of August 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.