Air carrier X TCASII TA RA with air carrier Y making visual approach to parallel runway.

Attributes
ACN	279164
Time
Date	199408
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lax
State Reference	CA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 19000 flight time type : 5000
ASRS Report	279164
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were cleared for the runway 25L ILS approach, and told that a commuter Y aircraft was to follow behind and land on runway 25R. We never had the aircraft in sight and never acknowledged that we did. At approximately 1500 ft AGL, TCASII issued TA and RA for a target which appeared to be immediately overhead (TCASII ordered steep descent). The RA continued throughout the next 1000 ft of descent, and our complete attention was focused on averting a midair with an unknown aircraft. At about 500 ft a brasilia turboprop appeared at the same altitude on approximately 100 yards away, overtaking us from behind. This is a dangerous, unnecessary way to allow arrs into lax. The incident could have easily been avoided if the aircraft from the south was assigned runway 25L and the straight in aircraft (our aircraft), runway 25R. Both pilots could have kept each other in sight at all times and no 'crossover' maneuver would have been necessary. I cannot stress how uncomfortable, and dangerous, this apparently-acceptable procedure is at lax.

Original NASA ASRS Text

Title: ACR X TCASII TA RA WITH ACR Y MAKING VISUAL APCH TO PARALLEL RWY.

Narrative: WE WERE CLRED FOR THE RWY 25L ILS APCH, AND TOLD THAT A COMMUTER Y ACFT WAS TO FOLLOW BEHIND AND LAND ON RWY 25R. WE NEVER HAD THE ACFT IN SIGHT AND NEVER ACKNOWLEDGED THAT WE DID. AT APPROX 1500 FT AGL, TCASII ISSUED TA AND RA FOR A TARGET WHICH APPEARED TO BE IMMEDIATELY OVERHEAD (TCASII ORDERED STEEP DSCNT). THE RA CONTINUED THROUGHOUT THE NEXT 1000 FT OF DSCNT, AND OUR COMPLETE ATTN WAS FOCUSED ON AVERTING A MIDAIR WITH AN UNKNOWN ACFT. AT ABOUT 500 FT A BRASILIA TURBOPROP APPEARED AT THE SAME ALT ON APPROX 100 YARDS AWAY, OVERTAKING US FROM BEHIND. THIS IS A DANGEROUS, UNNECESSARY WAY TO ALLOW ARRS INTO LAX. THE INCIDENT COULD HAVE EASILY BEEN AVOIDED IF THE ACFT FROM THE S WAS ASSIGNED RWY 25L AND THE STRAIGHT IN ACFT (OUR ACFT), RWY 25R. BOTH PLTS COULD HAVE KEPT EACH OTHER IN SIGHT AT ALL TIMES AND NO 'CROSSOVER' MANEUVER WOULD HAVE BEEN NECESSARY. I CANNOT STRESS HOW UNCOMFORTABLE, AND DANGEROUS, THIS APPARENTLY-ACCEPTABLE PROC IS AT LAX.

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.