Flight crew of an airbus 300-600 observed the wing of a king air go by during descent through the king air's VFR cruising altitude. ARTCC controller cleared the reporter down from FL180 to 11000 ft after passing the king air. Controller had given advisory of the king air and instructed the airbus to maintain visual separation with the king air.

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Attributes
ACN	395636
Time
Date	199803
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : eca
State Reference	CA
Altitude	msl bound lower : 17500 msl bound upper : 17500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A300
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 : zoa
Flight Plan	IFR
Aircraft 2
Make Model Name	Beechcraft Twin Turboprop Jet Undifferentiated or Other Model
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	other other : other pilot : commercial pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 12000 flight time type : 2500
ASRS Report	395636
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 2600 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were at FL180 and a VFR king air was at 17500 ft. ATC called the traffic and captain called traffic in sight. Captain told me it was going behind us. Center cleared us to 11000 ft when past king air. I started down. At about 17500 ft I saw a streak of left wing, level, and it must have been king air. King air pilot said 'that was close!' the center told him that we had him in visual contact. The captain had wrong traffic.

Original NASA ASRS Text

Title: FLC OF AN AIRBUS 300-600 OBSERVED THE WING OF A KING AIR GO BY DURING DSCNT THROUGH THE KING AIR'S VFR CRUISING ALT. ARTCC CTLR CLRED THE RPTR DOWN FROM FL180 TO 11000 FT AFTER PASSING THE KING AIR. CTLR HAD GIVEN ADVISORY OF THE KING AIR AND INSTRUCTED THE AIRBUS TO MAINTAIN VISUAL SEPARATION WITH THE KING AIR.

Narrative: WE WERE AT FL180 AND A VFR KING AIR WAS AT 17500 FT. ATC CALLED THE TFC AND CAPT CALLED TFC IN SIGHT. CAPT TOLD ME IT WAS GOING BEHIND US. CTR CLRED US TO 11000 FT WHEN PAST KING AIR. I STARTED DOWN. AT ABOUT 17500 FT I SAW A STREAK OF L WING, LEVEL, AND IT MUST HAVE BEEN KING AIR. KING AIR PLT SAID 'THAT WAS CLOSE!' THE CTR TOLD HIM THAT WE HAD HIM IN VISUAL CONTACT. THE CAPT HAD WRONG 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.