<< >> NASA ASRS Report 454671, November 1999

Flight crew of a B737-300 descended in response to a TCAS ii RA which was the direct opposite direction given by a TCAS ii RA due to having the intruder EMB120 aircraft in sight.

Attributes
ACN	454671
Time
Date	199911
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl bound lower : 6700 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 24l other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : ns
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 119
Navigation In Use	ils localizer & glide slope : 24r
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 5000
ASRS Report	454671
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : company policies non adherence other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

We were on ILS runway 24L. Brasilia was on ILS runway 24R. Brasilia was at our 4 O'clock position and about 50 ft higher than us. TCAS ii called, 'traffic, traffic.' a moment later TCAS ii called, 'climb, crossing, climb.' the co-pilot said, 'don't climb or we will hit him!' we descended and TCAS ii called, 'clear of conflict.' we maneuvered opposite to TCAS ii because the co-pilot had visual contact with the brasilia.

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Original NASA ASRS Text

Title: FLC OF A B737-300 DESCENDED IN RESPONSE TO A TCAS II RA WHICH WAS THE DIRECT OPPOSITE DIRECTION GIVEN BY A TCAS II RA DUE TO HAVING THE INTRUDER EMB120 ACFT IN SIGHT.

Narrative: WE WERE ON ILS RWY 24L. BRASILIA WAS ON ILS RWY 24R. BRASILIA WAS AT OUR 4 O'CLOCK POS AND ABOUT 50 FT HIGHER THAN US. TCAS II CALLED, 'TFC, TFC.' A MOMENT LATER TCAS II CALLED, 'CLB, CROSSING, CLB.' THE CO-PLT SAID, 'DON'T CLB OR WE WILL HIT HIM!' WE DESCENDED AND TCAS II CALLED, 'CLR OF CONFLICT.' WE MANEUVERED OPPOSITE TO TCAS II BECAUSE THE CO-PLT HAD VISUAL CONTACT WITH THE BRASILIA.

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.