Evasive action taken when TCASII RA activated.

Attributes
ACN	174857
Time
Date	199104
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	msl bound lower : 12000 msl bound upper : 12700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla tracon : ont
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	descent other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 22
ASRS Report	174857
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	unspecified : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Medium large transport was climbing out of ont going to trm when I observed and issued traffic, a VFR 14100' descending opp direction. Medium large transport was 12700' climbing and advised he was descending in compliance wit his RA. I rogered medium large transport and called ont approach control as he was still in their airspace. I then reissued the traffic and the pilot advised he had the traffic in sight. He had now descended back down to 12000'. Being on an IFR flight plan, this is rather dangerous, as I had the traffic on radar and had issued it to the pilot, yet he still took the TCAS instructions over ATC's.

Original NASA ASRS Text

Title: EVASIVE ACTION TAKEN WHEN TCASII RA ACTIVATED.

Narrative: MLG WAS CLBING OUT OF ONT GOING TO TRM WHEN I OBSERVED AND ISSUED TFC, A VFR 14100' DSNDING OPP DIRECTION. MLG WAS 12700' CLBING AND ADVISED HE WAS DSNDING IN COMPLIANCE WIT HIS RA. I ROGERED MLG AND CALLED ONT APCH CTL AS HE WAS STILL IN THEIR AIRSPACE. I THEN REISSUED THE TFC AND THE PLT ADVISED HE HAD THE TFC IN SIGHT. HE HAD NOW DSNDED BACK DOWN TO 12000'. BEING ON AN IFR FLT PLAN, THIS IS RATHER DANGEROUS, AS I HAD THE TFC ON RADAR AND HAD ISSUED IT TO THE PLT, YET HE STILL TOOK THE TCAS INSTRUCTIONS OVER ATC'S.

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.