Near midair collision between a descending SBR1 sabreliner 65 and a circling VFR cessna at 3000 ft in marginal flight conditions 3 mi southeast of 23J, fl.

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Attributes
ACN	550334
Time
Date	200206
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 23j.airport
State Reference	FL
Altitude	msl bound lower : 2500 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax.tracon
Operator	general aviation : corporate
Make Model Name	Sabreliner 65
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna 152
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 90 flight time total : 6500 flight time type : 2500
ASRS Report	550334
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : far other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera other flight crewa
Resolutory Action	controller : separated traffic controller : issued new clearance flight crew : took evasive action flight crew : returned to assigned altitude
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Problem Areas	ATC Human Performance Airspace Structure Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

This event occurred while descending into the jacksonville, fl, area from the south. Destination was jax. While on a vector heading and descending to the assigned altitude of 3000 ft MSL, the controller advised traffic. The traffic appeared to be maneuvering in the area and was not in communication with ATC. The TCASII indicated the traffic to be -200 ft from my altitude and 11 O'clock position. ATC directed a 30 degree turn for avoidance. The TCASII then issued an RA to descend. It then issued a command to monitor vertical speed. The resolution given by TCASII was for 2500 FPM descent. At that time the traffic became visible at 1 O'clock position and 200-300 ft horizontal and vertical. I continued a sharp right turn and descent until clear, leveling at 2500 ft MSL. After clear of conflict, returned to assigned altitude of 3000 ft MSL and notified ATC of the event. Causal factors: 1) other aircraft Y operating in vicinity, in VFR conditions. 2) other aircraft Y not communicating with ATC in a busy area.

Original NASA ASRS Text

Title: NMAC BTWN A DSNDING SBR1 SABRELINER 65 AND A CIRCLING VFR CESSNA AT 3000 FT IN MARGINAL FLT CONDITIONS 3 MI SE OF 23J, FL.

Narrative: THIS EVENT OCCURRED WHILE DSNDING INTO THE JACKSONVILLE, FL, AREA FROM THE S. DEST WAS JAX. WHILE ON A VECTOR HDG AND DSNDING TO THE ASSIGNED ALT OF 3000 FT MSL, THE CTLR ADVISED TFC. THE TFC APPEARED TO BE MANEUVERING IN THE AREA AND WAS NOT IN COM WITH ATC. THE TCASII INDICATED THE TFC TO BE -200 FT FROM MY ALT AND 11 O'CLOCK POS. ATC DIRECTED A 30 DEG TURN FOR AVOIDANCE. THE TCASII THEN ISSUED AN RA TO DSND. IT THEN ISSUED A COMMAND TO MONITOR VERT SPD. THE RESOLUTION GIVEN BY TCASII WAS FOR 2500 FPM DSCNT. AT THAT TIME THE TFC BECAME VISIBLE AT 1 O'CLOCK POS AND 200-300 FT HORIZ AND VERT. I CONTINUED A SHARP R TURN AND DSCNT UNTIL CLR, LEVELING AT 2500 FT MSL. AFTER CLR OF CONFLICT, RETURNED TO ASSIGNED ALT OF 3000 FT MSL AND NOTIFIED ATC OF THE EVENT. CAUSAL FACTORS: 1) OTHER ACFT Y OPERATING IN VICINITY, IN VFR CONDITIONS. 2) OTHER ACFT Y NOT COMMUNICATING WITH ATC IN A BUSY AREA.

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.