An air carrier medium large transport had less than standard separation with an undefined aircraft approaching bur. The air carrier reporting aircraft deviated its course to avoid a midair collision.

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Attributes
ACN	233888
Time
Date	199302
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bur
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bur tower : ewr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 540
ASRS Report	233888
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Between silex intersection and the buddle OM, we received numerous TA's on our TCASII. Constantly looking for the traffic caused by local traffic and van nuys airport made just plain navigating difficult. Approaching buddle, we were given a heading for the intercept. After acknowledging, we received a TA that turned to an RA and 'monitor vertical speed' was announced by the TCASII. The traffic was depicted climbing from our left off of van nuys airport and headed for us. I turned right which was declared clear by the first officer. The first officer, who was working the radio, was unable to get a word in until ATC asked where are we going? We explained, then he said we have traffic off our right and that's who he was worried about. Suddenly the ATC controller had all the time in the world to explain. He vectored us around and we landed without incident. We had the traffic off our right the whole time. Our concern was the impending collision off van nuys. The solution: ignorance is bliss -- eliminate TCASII or close van nuys.

Original NASA ASRS Text

Title: AN ACR MLG HAD LTSS WITH AN UNDEFINED ACFT APCHING BUR. THE ACR RPTING ACFT DEVIATED ITS COURSE TO AVOID A MIDAIR COLLISION.

Narrative: BTWN SILEX INTXN AND THE BUDDLE OM, WE RECEIVED NUMEROUS TA'S ON OUR TCASII. CONSTANTLY LOOKING FOR THE TFC CAUSED BY LCL TFC AND VAN NUYS ARPT MADE JUST PLAIN NAVING DIFFICULT. APCHING BUDDLE, WE WERE GIVEN A HDG FOR THE INTERCEPT. AFTER ACKNOWLEDGING, WE RECEIVED A TA THAT TURNED TO AN RA AND 'MONITOR VERT SPD' WAS ANNOUNCED BY THE TCASII. THE TFC WAS DEPICTED CLBING FROM OUR L OFF OF VAN NUYS ARPT AND HEADED FOR US. I TURNED R WHICH WAS DECLARED CLR BY THE FO. THE FO, WHO WAS WORKING THE RADIO, WAS UNABLE TO GET A WORD IN UNTIL ATC ASKED WHERE ARE WE GOING? WE EXPLAINED, THEN HE SAID WE HAVE TFC OFF OUR R AND THAT'S WHO HE WAS WORRIED ABOUT. SUDDENLY THE ATC CTLR HAD ALL THE TIME IN THE WORLD TO EXPLAIN. HE VECTORED US AROUND AND WE LANDED WITHOUT INCIDENT. WE HAD THE TFC OFF OUR R THE WHOLE TIME. OUR CONCERN WAS THE IMPENDING COLLISION OFF VAN NUYS. THE SOLUTION: IGNORANCE IS BLISS -- ELIMINATE TCASII OR CLOSE VAN NUYS.

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.