<< >> NASA ASRS Report 488123, October 2000

An air carrier flight crew flying a B737-400 at 3000 ft MSL near smo reports a TCASII RA and near midair collision.

Attributes
ACN	488123
Time
Date	200010
Day	Mon
Local Time Of Day	1201 To 1800
Place
State Reference	CA
Altitude	msl bound lower : 2500 msl bound upper : 3000
Environment
Flight Conditions	Marginal
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors arrival star : derbb
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 80 flight time total : 1700 flight time type : 80
ASRS Report	488123
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 90 flight time total : 15000 flight time type : 600
ASRS Report	487629
Events
Anomaly	conflict : airborne critical conflict : nmac
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

During approach to lax, we were cleared out of 7000 ft to 2500 ft on a 110 degree heading. Approximately 8 DME from smo passing through 3000 ft, we received a TCASII traffic alert at 3 NM off the nose. At 2700 ft, the TCASII switched to an RA and command 'stop rate of descent.' I was the PF so I immediately clicked off the autoplt and autothrottles, advanced the throttles, and pitched the nose up into a climb. As we climbed through 3000 ft, we spotted a low wing light aircraft approximately 1/2 mi off the nose. It passed just left of the nose, approximately 300 ft low and 500 ft laterally at the closest point. As we started our evasive maneuver, approach gave us a pointout to the traffic. We then descended to 2500 ft and continued with an uneventful approach and landing at lax.

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Original NASA ASRS Text

Title: AN ACR FLC FLYING A B737-400 AT 3000 FT MSL NEAR SMO RPTS A TCASII RA AND NMAC.

Narrative: DURING APCH TO LAX, WE WERE CLRED OUT OF 7000 FT TO 2500 FT ON A 110 DEG HDG. APPROX 8 DME FROM SMO PASSING THROUGH 3000 FT, WE RECEIVED A TCASII TFC ALERT AT 3 NM OFF THE NOSE. AT 2700 FT, THE TCASII SWITCHED TO AN RA AND COMMAND 'STOP RATE OF DSCNT.' I WAS THE PF SO I IMMEDIATELY CLICKED OFF THE AUTOPLT AND AUTOTHROTTLES, ADVANCED THE THROTTLES, AND PITCHED THE NOSE UP INTO A CLB. AS WE CLBED THROUGH 3000 FT, WE SPOTTED A LOW WING LIGHT ACFT APPROX 1/2 MI OFF THE NOSE. IT PASSED JUST L OF THE NOSE, APPROX 300 FT LOW AND 500 FT LATERALLY AT THE CLOSEST POINT. AS WE STARTED OUR EVASIVE MANEUVER, APCH GAVE US A POINTOUT TO THE TFC. WE THEN DSNDED TO 2500 FT AND CONTINUED WITH AN UNEVENTFUL APCH AND LNDG 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.