<< >> NASA ASRS Report 349240, October 1996

Air carrier L1011 performs evasive action climb in flight crew response to TCASII RA. Opposite direction VFR NORAC traffic. Late TA given.

Attributes
ACN	349240
Time
Date	199610
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	L-1011-500 Series
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : lax
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5500 flight time type : 2000
ASRS Report	349240
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was copilot on this flight and as we descended through 10500 ft on the civet arrival we received a TA on our TCASII. It was almost immediately followed by an RA. We broke our descent and began a climb as per TCASII command. As the VFR aircraft passed 500 ft under us socal approach called it out as VFR traffic. TCASII may very well have prevented a midair collision.

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Original NASA ASRS Text

Title: ACR L1011 PERFORMS EVASIVE ACTION CLB IN FLC RESPONSE TO TCASII RA. OPPOSITE DIRECTION VFR NORAC TFC. LATE TA GIVEN.

Narrative: I WAS COPLT ON THIS FLT AND AS WE DSNDED THROUGH 10500 FT ON THE CIVET ARR WE RECEIVED A TA ON OUR TCASII. IT WAS ALMOST IMMEDIATELY FOLLOWED BY AN RA. WE BROKE OUR DSCNT AND BEGAN A CLB AS PER TCASII COMMAND. AS THE VFR ACFT PASSED 500 FT UNDER US SOCAL APCH CALLED IT OUT AS VFR TFC. TCASII MAY VERY WELL HAVE PREVENTED A MIDAIR COLLISION.

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.