B737-800 flight crew, during turbulence, experiences a TCASII RA on climb.

Attributes
ACN	575110
Time
Date	200302
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zid.artcc
State Reference	IN
Altitude	msl single value : 24000
Environment
Flight Conditions	Mixed
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 12400 flight time type : 570
ASRS Report	575110
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical inflight encounter : turbulence inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 700
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Aircraft ATC Human Performance Weather
Primary Problem	Weather

Narrative:

Departed cvg, runway 27, whitewater departure. ATC advised of and we encountered moderate turbulence climbing out of FL210. ATC had us level off FL240 for traffic. Moderate turbulence was being reported up to FL310 and we were still in it. Traffic appeared on TCASII at approximately 10-11 O'clock position at 1000 ft above us. Noticed separation decrease to +400 ft then +800 ft. TCASII gave us a TA followed by an RA to descend. Followed TCASII and descended approximately 300-400 ft and advised ATC. ATC contacted other aircraft and he explained that he had encountered enough turbulence to cause the altitude deviation. We saw the aircraft pass overhead (we were between cloud layers at the time). I don't believe that loss of separation was less than 700-800 ft.

Original NASA ASRS Text

Title: B737-800 FLT CREW, DURING TURB, EXPERIENCES A TCASII RA ON CLB.

Narrative: DEPARTED CVG, RWY 27, WHITEWATER DEP. ATC ADVISED OF AND WE ENCOUNTERED MODERATE TURB CLBING OUT OF FL210. ATC HAD US LEVEL OFF FL240 FOR TFC. MODERATE TURB WAS BEING RPTED UP TO FL310 AND WE WERE STILL IN IT. TFC APPEARED ON TCASII AT APPROX 10-11 O'CLOCK POS AT 1000 FT ABOVE US. NOTICED SEPARATION DECREASE TO +400 FT THEN +800 FT. TCASII GAVE US A TA FOLLOWED BY AN RA TO DSND. FOLLOWED TCASII AND DSNDED APPROX 300-400 FT AND ADVISED ATC. ATC CONTACTED OTHER ACFT AND HE EXPLAINED THAT HE HAD ENCOUNTERED ENOUGH TURB TO CAUSE THE ALTDEV. WE SAW THE ACFT PASS OVERHEAD (WE WERE BTWN CLOUD LAYERS AT THE TIME). I DON'T BELIEVE THAT LOSS OF SEPARATION WAS LESS THAN 700-800 FT.

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.