Near midair collision on ILS at lax.

Attributes
ACN	114437
Time
Date	198906
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Light Transport
Flight Phase	descent : approach descent other
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 19500 flight time type : 11000
ASRS Report	114437
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 75 vertical : 75
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

We were cleared for an ILS to runway 25L to expect sidestep to 25R. Initially we had been told to keep speed up but quickly were slowed to 160 KT. Due to slow down was slightly high on glide slope. Just prior to outer marker and prior to being sent to tower frequency, a fairchild commuter aircraft came into view off my left, low side of the windshield. Very close. Immediately eased off toward right and saw him start a left turn. Distances were probably 50-11'. First officer asked about this aircraft. He contacted tower. Tower said that this aircraft had reported us in sight and was to keep a visual separation from us. We had not been informed of this traffic and had not yet been instructed to sidestep to 25R. We were still outside outer marker when near miss occurred and lined up with 25L. Somehow coordination failed. We were on an ILS to 25L. The commuter aircraft had been informed of and spotted us and was to keep a visual separation. We were not informed of that traffic nor told to sidestep to 25R. We were outside outer marker and still with approach control. Possibly the computer mistook some other aircraft from us. We were high and came up on him from above and from the right. Somehow we never got information on him, never saw him till he popped up from below/left and we were still on localizer to 25L and the commuter, who had reported us in sight, got too close as he had been told that we'd make approach to 25R.

Original NASA ASRS Text

Title: NMAC ON ILS AT LAX.

Narrative: WE WERE CLRED FOR AN ILS TO RWY 25L TO EXPECT SIDESTEP TO 25R. INITIALLY WE HAD BEEN TOLD TO KEEP SPEED UP BUT QUICKLY WERE SLOWED TO 160 KT. DUE TO SLOW DOWN WAS SLIGHTLY HIGH ON GLIDE SLOPE. JUST PRIOR TO OUTER MARKER AND PRIOR TO BEING SENT TO TWR FREQ, A FAIRCHILD COMMUTER ACFT CAME INTO VIEW OFF MY LEFT, LOW SIDE OF THE WINDSHIELD. VERY CLOSE. IMMEDIATELY EASED OFF TOWARD RIGHT AND SAW HIM START A LEFT TURN. DISTANCES WERE PROBABLY 50-11'. F/O ASKED ABOUT THIS ACFT. HE CONTACTED TWR. TWR SAID THAT THIS ACFT HAD REPORTED US IN SIGHT AND WAS TO KEEP A VISUAL SEPARATION FROM US. WE HAD NOT BEEN INFORMED OF THIS TFC AND HAD NOT YET BEEN INSTRUCTED TO SIDESTEP TO 25R. WE WERE STILL OUTSIDE OUTER MARKER WHEN NEAR MISS OCCURRED AND LINED UP WITH 25L. SOMEHOW COORD FAILED. WE WERE ON AN ILS TO 25L. THE COMMUTER ACFT HAD BEEN INFORMED OF AND SPOTTED US AND WAS TO KEEP A VISUAL SEPARATION. WE WERE NOT INFORMED OF THAT TFC NOR TOLD TO SIDESTEP TO 25R. WE WERE OUTSIDE OUTER MARKER AND STILL WITH APCH CTL. POSSIBLY THE COMPUTER MISTOOK SOME OTHER ACFT FROM US. WE WERE HIGH AND CAME UP ON HIM FROM ABOVE AND FROM THE RIGHT. SOMEHOW WE NEVER GOT INFO ON HIM, NEVER SAW HIM TILL HE POPPED UP FROM BELOW/LEFT AND WE WERE STILL ON LOC TO 25L AND THE COMMUTER, WHO HAD REPORTED US IN SIGHT, GOT TOO CLOSE AS HE HAD BEEN TOLD THAT WE'D MAKE APCH TO 25R.

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.