<< >> NASA ASRS Report 622860, July 2004

A B737-800 flight crew reported that they received a TCASII RA in sct's airspace, on an aircraft they had not been notified about.

Attributes
ACN	622860
Time
Date	200407
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	msl single value : 9600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	622860
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
ASRS Report	622802
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 3000 vertical : 200
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Assigned 10000 ft on climb out and advised traffic at 10500 ft. At 9600 ft, TCASII showed traffic 200 ft high and received RA to descend. Descended to 9300 ft, cleared traffic, resumed climb. When notified of the event, socal approach stated, 'my equipment shows him at 10500 ft.' supplemental information from acn 622802: at 9700 ft with a climb rate of approximately 500 FPM we received an RA from TCASII to descend. We responded to RA and descended to 9300 ft before leveling off. TCASII indicated other aircraft to be 200 ft above our altitude and less than 1/2 mi. We reported the RA with ATC and their response was the aircraft was at 10500 ft. We showed the aircraft to be at 9500 ft. There was another aircraft in the immediate vicinity (1 mi or less) which was indicating a slightly higher altitude, 3 airplanes within 1 1/2 mi of each other within 1000 ft. We continued climb without further incident after warning and clear of traffic.

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Original NASA ASRS Text

Title: A B737-800 FLT CREW RPTED THAT THEY RECEIVED A TCASII RA IN SCT'S AIRSPACE, ON AN ACFT THEY HAD NOT BEEN NOTIFIED ABOUT.

Narrative: ASSIGNED 10000 FT ON CLBOUT AND ADVISED TFC AT 10500 FT. AT 9600 FT, TCASII SHOWED TFC 200 FT HIGH AND RECEIVED RA TO DSND. DSNDED TO 9300 FT, CLRED TFC, RESUMED CLB. WHEN NOTIFIED OF THE EVENT, SOCAL APCH STATED, 'MY EQUIP SHOWS HIM AT 10500 FT.' SUPPLEMENTAL INFO FROM ACN 622802: AT 9700 FT WITH A CLB RATE OF APPROX 500 FPM WE RECEIVED AN RA FROM TCASII TO DSND. WE RESPONDED TO RA AND DSNDED TO 9300 FT BEFORE LEVELING OFF. TCASII INDICATED OTHER ACFT TO BE 200 FT ABOVE OUR ALT AND LESS THAN 1/2 MI. WE RPTED THE RA WITH ATC AND THEIR RESPONSE WAS THE ACFT WAS AT 10500 FT. WE SHOWED THE ACFT TO BE AT 9500 FT. THERE WAS ANOTHER ACFT IN THE IMMEDIATE VICINITY (1 MI OR LESS) WHICH WAS INDICATING A SLIGHTLY HIGHER ALT, 3 AIRPLANES WITHIN 1 1/2 MI OF EACH OTHER WITHIN 1000 FT. WE CONTINUED CLB WITHOUT FURTHER INCIDENT AFTER WARNING AND CLR OF TFC.

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.