Traffic conflict near jackson, ms. TCASII not followed in preference to see and avoid.

Attributes
ACN	478140
Time
Date	200006
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : jan.airport
State Reference	MS
Altitude	msl bound lower : 5000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jan.tracon
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tracon : jan.tracon
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 90 flight time total : 2350 flight time type : 400
ASRS Report	478140
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 90 flight time total : 5600 flight time type : 700
ASRS Report	478139
Events
Anomaly	conflict : airborne critical non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment : tcas other controllerb other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Supplementary
Problem Areas	Flight Crew Human Performance ATC Facility ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were handed off from ZMP to jackson approach. We were descending out of about 14000 ft. Around 7000 ft we were turned by approach to a 250 degree heading. Shortly he turned us to 270 degrees and called traffic at 12:30 O'clock position and 3 NM. At 5200 ft we were descending at 2500 FPM, at that point approach asked us to maintain 5000 ft. By then we were already taking evasive action. We were not able to maintain clearance because of our TCASII advisory alert. We saw the traffic coming at us on our TCASII. He was above our altitude, but descending rapidly at us, so we increased our descent rate as advised by TCASII. Once we realized we were not going to be able to meet TCASII requirement to turn and descend, we leveled off or slowed descent and airspeed as rapidly as possible to avoid any further conflict. The learjet then passed right to left in front of us at our altitude within 6000 ft to 3000 ft. There was nothing else we could do. We informed the controller and he admitted to making the mistake. I have no comment on a corrective action. The PF and myself were alert and vigilant. I cannot speak on behalf of the controller. Had it not been for TCASII a collision might have occurred.

Original NASA ASRS Text

Title: TFC CONFLICT NEAR JACKSON, MS. TCASII NOT FOLLOWED IN PREFERENCE TO SEE AND AVOID.

Narrative: WE WERE HANDED OFF FROM ZMP TO JACKSON APCH. WE WERE DSNDING OUT OF ABOUT 14000 FT. AROUND 7000 FT WE WERE TURNED BY APCH TO A 250 DEG HDG. SHORTLY HE TURNED US TO 270 DEGS AND CALLED TFC AT 12:30 O'CLOCK POS AND 3 NM. AT 5200 FT WE WERE DSNDING AT 2500 FPM, AT THAT POINT APCH ASKED US TO MAINTAIN 5000 FT. BY THEN WE WERE ALREADY TAKING EVASIVE ACTION. WE WERE NOT ABLE TO MAINTAIN CLRNC BECAUSE OF OUR TCASII ADVISORY ALERT. WE SAW THE TFC COMING AT US ON OUR TCASII. HE WAS ABOVE OUR ALT, BUT DSNDING RAPIDLY AT US, SO WE INCREASED OUR DSCNT RATE AS ADVISED BY TCASII. ONCE WE REALIZED WE WERE NOT GOING TO BE ABLE TO MEET TCASII REQUIREMENT TO TURN AND DSND, WE LEVELED OFF OR SLOWED DSCNT AND AIRSPD AS RAPIDLY AS POSSIBLE TO AVOID ANY FURTHER CONFLICT. THE LEARJET THEN PASSED R TO L IN FRONT OF US AT OUR ALT WITHIN 6000 FT TO 3000 FT. THERE WAS NOTHING ELSE WE COULD DO. WE INFORMED THE CTLR AND HE ADMITTED TO MAKING THE MISTAKE. I HAVE NO COMMENT ON A CORRECTIVE ACTION. THE PF AND MYSELF WERE ALERT AND VIGILANT. I CANNOT SPEAK ON BEHALF OF THE CTLR. HAD IT NOT BEEN FOR TCASII A COLLISION MIGHT HAVE OCCURRED.

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.