Flight crew of an MD82 took evasive action and descended and turned in response to approach controller instructions and TCASII RA. A single engine cessna was sighted within 500 ft through the left window.

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Attributes
ACN	420288
Time
Date	199811
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ont airport : ont
State Reference	CA
Altitude	msl bound lower : 10500 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-82
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors enroute airway : ont
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
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 : 156 flight time total : 14430 flight time type : 1096
ASRS Report	420288
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 4700 flight time type : 250
ASRS Report	420486
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 500 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

The first officer was flying the setter 2 arrival to ont and we were past psp at 14000 ft. We were cleared to 8000 ft and direct to petis NDB. While heading to petis and slowing to 250 KTS, our TCASII issued us a TA (within 2 NM) followed by a monitor vertical descent, a call from approach control for an immediate right turn and an RA descent command. We turned, descended, and I spotted a single engine cessna out the left side window! All happened within 15 seconds. I told approach that we saw the traffic and were clear of the conflict. We were then cleared to another approach frequency, then to tower and landed. I called the approach control supervisor and debriefed him on what had happened. He was concerned that traffic information might have not been given in a timely manner. Also, that some VFR traffic will not talk to anyone as they pass through that area. The dscnts to ont have to be aggressive in order to get aircraft down, which could also cause a problem with VFR traffic passing through.

Original NASA ASRS Text

Title: FLC OF AN MD82 TOOK EVASIVE ACTION AND DSNDED AND TURNED IN RESPONSE TO APCH CTLR INSTRUCTIONS AND TCASII RA. A SINGLE ENG CESSNA WAS SIGHTED WITHIN 500 FT THROUGH THE L WINDOW.

Narrative: THE FO WAS FLYING THE SETTER 2 ARR TO ONT AND WE WERE PAST PSP AT 14000 FT. WE WERE CLRED TO 8000 FT AND DIRECT TO PETIS NDB. WHILE HDG TO PETIS AND SLOWING TO 250 KTS, OUR TCASII ISSUED US A TA (WITHIN 2 NM) FOLLOWED BY A MONITOR VERT DSCNT, A CALL FROM APCH CTL FOR AN IMMEDIATE R TURN AND AN RA DSCNT COMMAND. WE TURNED, DSNDED, AND I SPOTTED A SINGLE ENG CESSNA OUT THE L SIDE WINDOW! ALL HAPPENED WITHIN 15 SECONDS. I TOLD APCH THAT WE SAW THE TFC AND WERE CLR OF THE CONFLICT. WE WERE THEN CLRED TO ANOTHER APCH FREQ, THEN TO TWR AND LANDED. I CALLED THE APCH CTL SUPVR AND DEBRIEFED HIM ON WHAT HAD HAPPENED. HE WAS CONCERNED THAT TFC INFO MIGHT HAVE NOT BEEN GIVEN IN A TIMELY MANNER. ALSO, THAT SOME VFR TFC WILL NOT TALK TO ANYONE AS THEY PASS THROUGH THAT AREA. THE DSCNTS TO ONT HAVE TO BE AGGRESSIVE IN ORDER TO GET ACFT DOWN, WHICH COULD ALSO CAUSE A PROB WITH VFR TFC PASSING THROUGH.

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.