Atx questioned controller about VFR traffic in close proximity ot him. No traffic issued.

Attributes
ACN	110064
Time
Date	198904
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ida
State Reference	ID
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	common carrier : air taxi
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 8 controller radar : 25
ASRS Report	110064
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

A situation such as cerritos happened in this situation. The atx was en route from pih to ida via V21 at 9000'. There was an occasional radar hit on a VFR mode C/non mode C on the arwy presumable low. At one point the atx asked me if I saw a VFR target anywhere close to him. I said, 'not at this time,' but right at that moment there was the VFR aircraft, the atx, and an air carrier all overlapping due to beacon split. I had to determine who was where. The atx said he passed the VFR aircraft at the same altitude, but not close enough to take evasive action. I feel aircraft conducting parachute drops or practice flight techniques should not be in the vicinity of popular arwys used by air taxi and air carrier aircraft.

Original NASA ASRS Text

Title: ATX QUESTIONED CTLR ABOUT VFR TRAFFIC IN CLOSE PROX OT HIM. NO TRAFFIC ISSUED.

Narrative: A SITUATION SUCH AS CERRITOS HAPPENED IN THIS SITUATION. THE ATX WAS ENRTE FROM PIH TO IDA VIA V21 AT 9000'. THERE WAS AN OCCASIONAL RADAR HIT ON A VFR MODE C/NON MODE C ON THE ARWY PRESUMABLE LOW. AT ONE POINT THE ATX ASKED ME IF I SAW A VFR TARGET ANYWHERE CLOSE TO HIM. I SAID, 'NOT AT THIS TIME,' BUT RIGHT AT THAT MOMENT THERE WAS THE VFR ACFT, THE ATX, AND AN ACR ALL OVERLAPPING DUE TO BEACON SPLIT. I HAD TO DETERMINE WHO WAS WHERE. THE ATX SAID HE PASSED THE VFR ACFT AT THE SAME ALT, BUT NOT CLOSE ENOUGH TO TAKE EVASIVE ACTION. I FEEL ACFT CONDUCTING PARACHUTE DROPS OR PRACTICE FLT TECHNIQUES SHOULD NOT BE IN THE VICINITY OF POPULAR ARWYS USED BY AIR TAXI AND ACR ACFT.

Data retrieved from NASA's ASRS site as of August 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.