Air carrier on final has near midair collision with commuter traffic called but not sighted. Commuter assigned parallel runway.

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Attributes
ACN	148680
Time
Date	199006
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ont
State Reference	CA
Altitude	agl bound lower : 500 agl bound upper : 650
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ont
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6800 flight time type : 1800
ASRS Report	148680
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

While on ILS final to runway 26L at ontario, ca, and flying into a low sun angle with haze and smoke, ontario tower had called out an small transport, light transport, medium large transport, and then an small aircraft commuter turbo propeller which was turning a right base for the parallel runway 26R. I was the PF. When I finally saw the commuter, he was about our 3-4 O'clock position, 100' horizontal and 150' vertical. I continued the descent and told the tower to tell commuter to go-around. Commuter acknowledged and the tower told him to go-around. After landing we told ontario ground control that we would be filing a near miss report. This could have been prevented by the tower calling commuter flight's turn to base to provide spacing or not allowing commuter flight to turn base until he reported 'traffic in sight', the commuter pilot could have prevented the near miss by not turning final until he had his traffic (us) in sight or requesting tower to call his base because traffic was not in sight.

Original NASA ASRS Text

Title: ACR ON FINAL HAS NMAC WITH COMMUTER TRAFFIC CALLED BUT NOT SIGHTED. COMMUTER ASSIGNED PARALLEL RWY.

Narrative: WHILE ON ILS FINAL TO RWY 26L AT ONTARIO, CA, AND FLYING INTO A LOW SUN ANGLE WITH HAZE AND SMOKE, ONTARIO TWR HAD CALLED OUT AN SMT, LTT, MLG, AND THEN AN SMA COMMUTER TURBO PROP WHICH WAS TURNING A R BASE FOR THE PARALLEL RWY 26R. I WAS THE PF. WHEN I FINALLY SAW THE COMMUTER, HE WAS ABOUT OUR 3-4 O'CLOCK POS, 100' HORIZ AND 150' VERT. I CONTINUED THE DSNT AND TOLD THE TWR TO TELL COMMUTER TO GO-AROUND. COMMUTER ACKNOWLEDGED AND THE TWR TOLD HIM TO GO-AROUND. AFTER LNDG WE TOLD ONTARIO GND CTL THAT WE WOULD BE FILING A NEAR MISS RPT. THIS COULD HAVE BEEN PREVENTED BY THE TWR CALLING COMMUTER FLT'S TURN TO BASE TO PROVIDE SPACING OR NOT ALLOWING COMMUTER FLT TO TURN BASE UNTIL HE RPTED 'TFC IN SIGHT', THE COMMUTER PLT COULD HAVE PREVENTED THE NEAR MISS BY NOT TURNING FINAL UNTIL HE HAD HIS TFC (US) IN SIGHT OR REQUESTING TWR TO CALL HIS BASE BECAUSE TFC WAS NOT IN SIGHT.

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.