<< >> NASA ASRS Report 333669, April 1996

A captain reports that traffic came within 500 ft vertically and horizontally. The flight crew did not receive a TCASII alert or an advisory from ATC.

Attributes
ACN	333669
Time
Date	199604
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ccr
State Reference	CA
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 9000 flight time type : 7000
ASRS Report	333669
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Over ccr VOR in VMC at 11000 ft and 280 KTS, a medium twin aircraft (white with a black stripe) passed about 500 ft in front and maybe 500 ft below, heading 120 degrees. No TCASII alert and the controller was very busy. We saw this aircraft at about 1 mi. No evasive action.

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Original NASA ASRS Text

Title: A CAPT RPTS THAT TFC CAME WITHIN 500 FT VERTLY AND HORIZLY. THE FLC DID NOT RECEIVE A TCASII ALERT OR AN ADVISORY FROM ATC.

Narrative: OVER CCR VOR IN VMC AT 11000 FT AND 280 KTS, A MEDIUM TWIN ACFT (WHITE WITH A BLACK STRIPE) PASSED ABOUT 500 FT IN FRONT AND MAYBE 500 FT BELOW, HDG 120 DEGS. NO TCASII ALERT AND THE CTLR WAS VERY BUSY. WE SAW THIS ACFT AT ABOUT 1 MI. NO EVASIVE ACTION.

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.