An A320 flight crew has an near midair collision with a light aircraft, same direction traffic, 400 ft below at kayon intersection during their approach to sna, ca.

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Attributes
ACN	534092
Time
Date	200112
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : kayoh
State Reference	CA
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : personal
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	534092
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : nmac inflight encounter : weather inflight encounter other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	ATC Human Performance Environmental Factor Airspace Structure Flight Crew Human Performance ATC Facility Aircraft
Primary Problem	Airspace Structure

Narrative:

TCASII alert in descent passing approximately 7000 ft. Aircraft on TCASII showed ahead about 1/2 mi and 600 ft below, acquired visually as TCASII RA sounded. Decreased descent rate and we passed about 400 ft over the top of a single engine high wing aircraft. Aircraft was very gray in appearance on a gray overcast twilight and going in our direction, so they could not have seen us until we passed them. ATC said he did not see aircraft on radar before we called it out and it popped up on TCASII suddenly -- thank goodness.

Original NASA ASRS Text

Title: AN A320 FLC HAS AN NMAC WITH A LIGHT ACFT, SAME DIRECTION TFC, 400 FT BELOW AT KAYON INTXN DURING THEIR APCH TO SNA, CA.

Narrative: TCASII ALERT IN DSCNT PASSING APPROX 7000 FT. ACFT ON TCASII SHOWED AHEAD ABOUT 1/2 MI AND 600 FT BELOW, ACQUIRED VISUALLY AS TCASII RA SOUNDED. DECREASED DSCNT RATE AND WE PASSED ABOUT 400 FT OVER THE TOP OF A SINGLE ENG HIGH WING ACFT. ACFT WAS VERY GRAY IN APPEARANCE ON A GRAY OVCST TWILIGHT AND GOING IN OUR DIRECTION, SO THEY COULD NOT HAVE SEEN US UNTIL WE PASSED THEM. ATC SAID HE DID NOT SEE ACFT ON RADAR BEFORE WE CALLED IT OUT AND IT POPPED UP ON TCASII SUDDENLY -- THANK GOODNESS.

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.