Near midair collision. TCASII. Aircraft on coupled ILS approach. Intruder aircraft, instructed by ATC to maintain visual separation, they didn't. WX conditions marginal. Intruder aircraft descended on top of reporter who received TCASII RA. Evasive action initiated.

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Attributes
ACN	326783
Time
Date	199601
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : commercial pilot : instrument pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 170 flight time total : 7200 flight time type : 1500
ASRS Report	326783
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 1600
ASRS Report	326278
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew faa : investigated
Miss Distance	horizontal : 200 vertical : 10
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On final approach to runway 24R, we were coupled up for an autoland. We were on GS and on localizer when we got a corrective RA alert from our TCASII to climb. First officer initiated climb and I started to look for the traffic. When we looked out the left side of the aircraft, I saw a light transport at about our 10 O'clock position and approximately 10 ft above and 200 ft to our left. At that time the captain took the controls and continued climbing and started a right turn away from the traffic. We informed ATC of our near miss and requested vectors back for another approach. Visibility was poor and it was our understanding from our conversation on the phone with ATC that the light transport was supposed to have stayed behind us and kept us in his sight. Apparently that was not the case. Separation should have been monitored by ATC even if the light transport said they had us in sight.

Original NASA ASRS Text

Title: NMAC. TCASII. ACFT ON COUPLED ILS APCH. INTRUDER ACFT, INSTRUCTED BY ATC TO MAINTAIN VISUAL SEPARATION, THEY DIDN'T. WX CONDITIONS MARGINAL. INTRUDER ACFT DSNDED ON TOP OF RPTR WHO RECEIVED TCASII RA. EVASIVE ACTION INITIATED.

Narrative: ON FINAL APCH TO RWY 24R, WE WERE COUPLED UP FOR AN AUTOLAND. WE WERE ON GS AND ON LOC WHEN WE GOT A CORRECTIVE RA ALERT FROM OUR TCASII TO CLB. FO INITIATED CLB AND I STARTED TO LOOK FOR THE TFC. WHEN WE LOOKED OUT THE L SIDE OF THE ACFT, I SAW A LTT AT ABOUT OUR 10 O'CLOCK POS AND APPROX 10 FT ABOVE AND 200 FT TO OUR L. AT THAT TIME THE CAPT TOOK THE CTLS AND CONTINUED CLBING AND STARTED A R TURN AWAY FROM THE TFC. WE INFORMED ATC OF OUR NEAR MISS AND REQUESTED VECTORS BACK FOR ANOTHER APCH. VISIBILITY WAS POOR AND IT WAS OUR UNDERSTANDING FROM OUR CONVERSATION ON THE PHONE WITH ATC THAT THE LTT WAS SUPPOSED TO HAVE STAYED BEHIND US AND KEPT US IN HIS SIGHT. APPARENTLY THAT WAS NOT THE CASE. SEPARATION SHOULD HAVE BEEN MONITORED BY ATC EVEN IF THE LTT SAID THEY HAD US 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.