DH8 landing cvg experienced turbulence and conflict.

Attributes
ACN	586581
Time
Date	200307
Day	Fri
Place
Locale Reference	airport : cvg.airport
State Reference	OH
Altitude	msl bound lower : 4000 msl bound upper : 6000
Environment
Flight Conditions	IMC
Weather Elements	Turbulence
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : cvg.tracon tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : cvg.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : atp pilot : multi engine
Experience	flight time last 90 days : 280 flight time total : 4200 flight time type : 1900
ASRS Report	580581
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 100
Supplementary
Problem Areas	Weather Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

Our aircraft was being vectored on a left downwind for runway 18L at cvg. We entered an area of moderate, occasionally severe turbulence as we were told to 'turn left heading runway 270, descend from 6000 ft to 4000 ft.' we were unable to maintain heading and altitude precisely as the turn and descent was initiated. At this time, our TCASII sounded a TA alert, followed quickly by an RA. I advanced throttles to maximum power and initiated a climb as directed. Cvg approach simultaneously told us to descend now. Due to the proximity of the TCASII target to our position on the TCASII display, I also initiated a hard roll to the left. Recovery, visual approach, and landing were normal.

Original NASA ASRS Text

Title: DH8 LNDG CVG EXPERIENCED TURB AND CONFLICT.

Narrative: OUR ACFT WAS BEING VECTORED ON A L DOWNWIND FOR RWY 18L AT CVG. WE ENTERED AN AREA OF MODERATE, OCCASIONALLY SEVERE TURB AS WE WERE TOLD TO 'TURN L HDG RWY 270, DSND FROM 6000 FT TO 4000 FT.' WE WERE UNABLE TO MAINTAIN HDG AND ALT PRECISELY AS THE TURN AND DSCNT WAS INITIATED. AT THIS TIME, OUR TCASII SOUNDED A TA ALERT, FOLLOWED QUICKLY BY AN RA. I ADVANCED THROTTLES TO MAX POWER AND INITIATED A CLB AS DIRECTED. CVG APCH SIMULTANEOUSLY TOLD US TO DSND NOW. DUE TO THE PROX OF THE TCASII TARGET TO OUR POS ON THE TCASII DISPLAY, I ALSO INITIATED A HARD ROLL TO THE L. RECOVERY, VISUAL APCH, AND LNDG WERE NORMAL.

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.